Who's vs. Whose: The Difference, the Test, and the One Rule Nobody Teaches

Who's is a contraction. It means who is or who has. Whose is a possessive. It means belonging to whom. If you can replace the word with who is or who has and the sentence still makes sense, write who's. If you can't, write whose.

Who's at the door? (Who is at the door?) Whose coat is this? (The coat belonging to whom?)

That is the whole rule, and it resolves most cases in about a second. The rest of this guide covers the situations where the test gets harder, the reason the apostrophe confuses everyone, and a usage question that most grammar sites either skip or get wrong.

Contents

1. The one second test, and its limits
2. Who's: the contraction
3. The hidden limit on who's meaning "who has"
4. Whose: the possessive
5. Why whose has no apostrophe
6. Where the mistake actually happens: relative clauses
7. The second hotspot: indirect questions
8. Whose for things, not just people
9. The one place whose for things breaks down
10. The alternatives to whose, and why they are usually worse
11. The reverse error
12. Whom's is not a word
13. Who's who and other fixed expressions
14. Why spell check will not save you
15. The same mistake in three other pairs
16. Practice exercises with answers
17. Frequently asked questions
18. Sources

1. The one second test, and its limits

Replace the word with who is. If that fails, try who has. If either one works, the apostrophe belongs there.

Who's coming to dinner? → Who is coming to dinner? ✓ So: who's. Whose car is blocking the driveway? → Who is car is blocking? ✗ → Who has car? ✗ So: whose.

This test is reliable, and it is the right tool for most sentences. It has one real weakness, though, which is worth knowing in advance: it depends on you hearing the expanded version clearly enough to judge it. In a long sentence, especially one where the word sits in the middle rather than at the front, the expansion can be hard to evaluate.

The researcher who's / whose findings were published last spring will present on Thursday.

Here the expansion is who is findings were published, which is clearly broken, so the answer is whose. But many writers never run the test in a sentence like this one, because the word doesn't feel like a question word anymore. It feels like a connector. Section 6 addresses that situation directly, since it is where the great majority of real errors occur.

A second, more mechanical check works when the first one feels slippery. Ask what follows the word.

If a noun follows, you almost certainly need whose, because whose works like a possessive adjective and attaches to a noun.

whose car, whose findings, whose idea, whose turn

If a verb or an adjective follows, you probably need who's, because the contraction already contains the verb.

who's driving, who's late, who's been waiting, who's responsible

This second check is not airtight, but it catches the cases where the substitution test feels ambiguous.

2. Who's: the contraction

An apostrophe in English does one of two jobs. It marks a possessive on a noun (the dog's collar), or it marks a missing letter in a contraction (don't, I'll, she'd). In who's, it is doing the second job, not the first.

Who's = who is

Who's going to the meeting? I don't know who's in charge. She's the one who's always early. Who's ready to order? Tell me who's responsible for this.

Who's = who has

Who's finished the report? He's the only candidate who's met every requirement. Who's been using my coffee mug? I need someone who's done this before.

Notice what the apostrophe replaces. In who is, it replaces the i. In who has, it replaces the ha. The apostrophe is standing in for deleted letters in both cases, exactly as it does in can't and we'll.

This is the single most useful thing to understand about the pair. Who's has an apostrophe not because it shows possession, but because letters are missing. Once that clicks, the fact that whose has no apostrophe stops looking like an exception.

3. The hidden limit on who's meaning "who has"

Here is a rule that almost no guide to this pair mentions, and it matters because it quietly produces sentences that sound wrong without the writer knowing why.

Who's can mean "who has" only when has is an auxiliary verb.

An auxiliary has is the one that helps build a perfect tense. It sits in front of a past participle.

Who's finished? = Who has finished? ✓ Who's seen my keys? = Who has seen my keys? ✓ Who's been to Japan? = Who has been to Japan? ✓

A main verb has is the one that means possesses. It does not contract this way.

Who has a pen? ✓ ✗ Who's a pen?

That second sentence does not read as "who has a pen." It reads as "who is a pen," which is nonsense. English allows contraction of auxiliary have freely, but resists contracting possessive have, and in this particular case the contraction collides with who is and loses.

The practical consequence: if you mean "who possesses," spell out has.

✓ Who has the budget for this? ✓ Who's got the budget for this? (here got is a participle, so has is an auxiliary again) ✗ Who's the budget for this?

That last one is a real error that appears in casual writing, and the writer usually cannot say what went wrong. This is what went wrong.

4. Whose: the possessive

Whose asks about or identifies ownership, belonging, or association. Grammatically it functions as a determiner in most of its uses, which is a precise way of saying that it attaches to a noun and specifies it, the way my or their does.

In direct questions

Whose turn is it? Whose phone keeps ringing? Whose idea was this? Whose signature is on the form?

In statements, introducing a clause

The author whose book we read last month is speaking tonight. I met a woman whose daughter went to my high school. They hired a contractor whose references checked out.

Occasionally as a pronoun standing alone

I found a jacket, but I don't know whose it is. Whose are these?

Compare the shape of whose to the other possessive words in English:

my, your, his, her, its, our, their, whose

Not one of them takes an apostrophe. Whose is a member of that set, not an exception to a rule about apostrophes. Section 5 explains why that set exists in the first place.

5. Why whose has no apostrophe

Every guide tells you that possessive pronouns do not take apostrophes. Very few tell you why, which leaves the rule sitting in your memory as an arbitrary fact you have to maintain by effort. The actual reason is a matter of chronology, and once you know it the rule maintains itself.

The apostrophe is a newcomer. These words are much older.

The apostrophe entered English in the sixteenth century, borrowed from French printing practice. It took until roughly the eighteenth century for apostrophe plus s to become the regular way to mark a possessive singular noun, and the possessive plural convention (the girls' dresses) was not universally settled until the middle of the nineteenth century.

Now consider what English already had before any of that. Who, he, she, it, and they all carried inherited possessive forms from Old English, built by changing the word itself rather than by adding punctuation.

who → whose (from Old English hwæs) he → his she → her it → its they → their

These forms were fully formed and in daily use centuries before the apostrophe existed in English at all. There was never an occasion to add one, because nothing was missing and nothing needed marking. The word was already possessive on its own.

The apostrophe was then applied to nouns, which had no dedicated possessive form and genuinely needed a marker. Dog does not become dogis or doghis; it needs dog's. Pronouns never had that problem.

So the honest statement of the rule is not "possessive pronouns are an exception." It is: the apostrophe was invented to solve a problem that these words never had.

Nobody writes hi's for his. Nobody writes the'ir for their. Whose belongs to exactly that family, and it needs an apostrophe exactly as much as his does, which is to say not at all.

There is a satisfying footnote here. Its was in fact written it's in the seventeenth century, and the apostrophe was dropped by the early nineteenth century, apparently to bring it into line with the other possessive pronouns. English tidied itself up. The modern mistake of writing it's for the possessive is, in a sense, a four hundred year old spelling making an unauthorized comeback.

6. Where the mistake actually happens: relative clauses

In a direct question, almost nobody gets this wrong. Whose coat is this? feels right immediately. The error rate in real writing is concentrated somewhere else entirely, and understanding where is more useful than reviewing the basic rule again.

The problem zone is the relative clause: a clause that attaches to a noun and tells you more about it. Both who's and whose can introduce one, which is precisely why the position is dangerous.

the engineer who's reviewing the design (who is reviewing) the engineer whose design we're reviewing (the design belonging to the engineer)

Both sentences are correct. They are also nearly identical in sound and shape, and they differ only in whether the following words describe what the engineer is doing or what the engineer possesses.

Here is the pattern to internalize. In a relative clause:

Use who's when the word is followed by what the person is doing or being. The person is the subject of the clause.

the neighbor who's always complaining a manager who's worked here for twenty years the student who's been absent all week anyone who's interested in joining

Use whose when the word is followed by something the person owns, holds, or is connected to. The person is not the subject of the clause. The thing is.

the neighbor whose dog barks all night a manager whose team exceeded its targets the student whose essay won the prize anyone whose name appears on the list

Read those two lists again and notice the structural difference. After who's, the next word is a verb or an adjective. After whose, the next word is a noun, and that noun is what the clause is really about. Whose dog barks is a clause whose subject is dog, not neighbor.

This is why the substitution test sometimes fails people in mid sentence. They are no longer thinking of the word as a question word, so they never think to expand it. The structural check (noun or verb?) is faster here, and it is more reliable in exactly the position where the error lives.

7. The second hotspot: indirect questions

An indirect question is a question folded inside a statement. It does not end with a question mark, and the word order is not inverted the way a direct question's would be.

Direct: Whose keys are these? Indirect: I wonder whose keys these are.

Both forms are common, and both can take either word, which makes this the second place errors cluster.

I don't know who's coming. (who is coming) I don't know whose this is. (belonging to whom)

Can you find out who's available on Friday? (who is available) Can you find out whose signature we still need? (the signature belonging to whom)

Nobody told me who's in charge. (who is in charge) Nobody told me whose decision it was. (the decision belonging to whom)

The substitution test works perfectly well in indirect questions. The difficulty is purely that the writer, having already committed to a statement, stops treating the word as a question word and reaches for whichever spelling looks familiar. Slowing down for one beat at this exact spot catches most of these.

8. Whose for things, not just people

This is the part of the subject where the popular guides are either silent or quietly misleading, and it is the question a careful writer most often actually has.

Is this sentence acceptable?

This is the book whose cover got damaged in shipping.

A book is not a person. Whose is the possessive of who, and who refers to people. By that logic, the sentence should be wrong, and many people have been taught that it is.

It is not wrong, and the objection to it rests on a mistake about the history of the language.

English has a gap, and whose fills it

Which and that have no possessive forms. There is no whiches and no thats. English simply never developed one, which leaves a hole in the grammar whenever you want to attach a possessive to a non personal antecedent.

Writers have been plugging that hole with whose since the medieval period. Merriam-Webster documents the practice "from the medieval times onward," and cites Shakespeare's Hamlet (1601), Milton's Paradise Lost (1667), Austen's Pride and Prejudice (1813), and Fitzgerald's The Great Gatsby (1925). The King James Bible uses it at Genesis 11:4, in the phrase whose top may reach unto heaven. In 1917 the scholar John Lesslie Hall surveyed the literature and found more than a thousand instances across roughly a hundred and forty authors, spanning the fifteenth to the twentieth centuries.

The first recorded use of inanimate relative whose dates to 1479, which is only about fifty years after the first recorded relative who. The two uses are essentially contemporaries. One is not a late corruption of the other.

There is a genuine etymological surprise here

The usual assumption is that whose is the possessive of who, full stop, and that using it for things is a borrowing or a stretch.

The actual history is more interesting. Old English had a genitive form hwæs, which served as the genitive of hwæt, the word that became modern what. That form developed into modern whose, and it functioned as the genitive of which.

In other words, whose has a legitimate claim to non personal reference in its own ancestry. It is not trespassing on territory that belongs to which. It arrived there first.

Where the prohibition came from

The objection is traceable, and it is young relative to the usage it objects to. Eighteenth century grammarians took notice of the construction and decided it should be restricted. Robert Lowth (1764) disapproved of it except in "the higher Poetry." Samuel Johnson (1785) called it "rather the poetic than the regular genitive of which." Noah Webster (1798) disapproved. Later commentators repeated the objection through the nineteenth century, and it entered the school tradition from there.

Where the authorities stand now

The modern consensus is close to unanimous, and it runs against the prohibition.

H. W. Fowler attacked the rule directly in 1926. Ernest Gowers called it "cramping" in 1954. Merriam-Webster's Dictionary of English Usage describes the prohibition as a superstition and the construction as standard. The Cambridge Grammar of the English Language (Huddleston and Pullum, 2002) treats such genitives as completely grammatical. The Chicago Manual of Style describes the usage as widely accepted as a way of avoiding awkwardness. Bryan Garner calls it, in many sentences, an inescapable way to avoid clumsiness. Robert Burchfield (1996) and Jeremy Butterfield (2015) both characterize avoiding it as a folk belief.

So the following sentences are all standard English:

a company whose profits have tripled the novel whose ending everyone argues about a policy whose consequences nobody anticipated an idea whose time has come the building whose facade was restored last year

One honest caveat

Knowing that a usage is standard is not the same as knowing that every reader knows it. A 1974 survey by Mary Vaiana Taylor found that about two thirds of post secondary teaching assistants would still mark inanimate whose as an error.

That figure is half a century old and attitudes have continued to move, but the practical lesson holds. If you are writing for a grader, an editor, or a reviewer who may be working from the school tradition, you are making a judgment call about your reader rather than about the grammar. The grammar is settled. In that situation you can either use whose and be correct, or rephrase and sidestep the question, which is what section 10 is about.

9. The one place whose for things breaks down

There is a real limit, and it is a sharp one. It is also the detail that separates an accurate account of this topic from a vague one.

Inanimate whose works in relative clauses. It does not work in direct questions.

In a relative clause, referring to a thing is fine:

✓ the book whose pages are torn

In a direct question, the same reference fails:

✗ Whose pages are torn?

That question does not ask about a book. A listener hears it as asking which person the pages belong to. Interrogative whose always refers to people. Otto Jespersen noted this asymmetry, Merriam-Webster states the same exception explicitly, and descriptive grammars agree: relative whose can take an inanimate antecedent, while interrogative whose cannot.

When you need to ask that kind of question about a thing, restructure it:

✓ Which book has torn pages? ✓ Which of these has a torn cover? ✓ What's the title of the book with the torn pages?

This is a clean, memorable rule, and it is the kind of detail that explains a sentence that felt wrong for reasons you couldn't name.

10. The alternatives to whose, and why they are usually worse

If you decide to avoid inanimate whose, you have two options. Both have costs, and it is worth seeing them plainly rather than assuming the alternative is automatically safer.

Option one: of which. This is the construction the eighteenth century grammarians recommended.

a movie whose title I couldn't remember a movie the title of which I couldn't remember a movie, of which the title escaped me

The second and third versions are grammatical. They are also noticeably heavier, and in a long sentence they can bury the point. Merriam-Webster describes of which as frequently clumsy or stilted. Henry Bradley, writing for the Oxford English Dictionary, allowed that of which usually serves as a replacement except where it would be intolerably clumsy, which concedes that the clumsiness is real. Of which can work well in deliberately formal or literary prose. It works badly in ordinary writing, and it works especially badly when the possessed noun is several words long.

Option two: rewrite the sentence. Often the cleanest solution is to drop the possessive construction entirely.

the car whose windshield was cracked the car with the cracked windshield

This is usually the best option when it is available, because it is shorter than both alternatives and raises no usage question at all. It is not always available, though, and forcing it can distort your sentence more than the original construction ever would.

The reasonable position: use whose by default, because it is standard and it is lighter. Reach for of which when the register is formal and the rhythm supports it. Rewrite when the rewrite is genuinely better, not merely safer.

11. The reverse error

Almost all the attention goes to writing who's where whose belongs. The opposite error is less common but more revealing, because it usually comes from caution rather than carelessness.

✗ Do you know whose coming to the meeting? ✓ Do you know who's coming to the meeting?

✗ She's the one whose been handling the account. ✓ She's the one who's been handling the account.

✗ I'll ask whose available on Thursday. ✓ I'll ask who's available on Thursday.

This happens to writers who have been corrected for apostrophe mistakes often enough to become suspicious of apostrophes in general. They develop a rule of thumb that apostrophes are where errors live, and they start removing them defensively.

The fix is the same substitution test, run in the other direction. Expand the contraction and listen.

Do you know who is coming to the meeting? ✓ So the apostrophe belongs.

Note the giveaway in all three examples: the word is followed by a verb or an adjective, not by a noun. That is the structural signature of who's.

12. Whom's is not a word

Occasionally a writer aiming for formality produces whom's. It does not exist in standard English, in either of the two jobs it might seem to do.

It cannot be a possessive, because whom has no possessive form. The possessive of both who and whom is whose.

✓ the client whose account we lost ✗ the client whom's account we lost

It cannot be a contraction either, because whom is an object pronoun and so cannot be the subject of is or has. There is no whom is to contract.

✓ Who's calling? (Who is calling?) ✗ Whom's calling?

If you want the quick version of who against whom: who is the subject, whom is the object. And whose covers possession for both, which means that in the one place writers most expect to need whom, they need whose.

13. Who's who and other fixed expressions

A few set phrases are worth knowing because they look like mistakes until you've seen them before.

Who's who. The phrase refers to a directory of notable people, or by extension to the identities of the people in a group. Both words are correct exactly as written, and the apostrophe belongs.

She's listed in Who's Who in American Law. After five minutes in the meeting, I still couldn't tell who's who.

The logic holds up to the test: who is who. The expression means, roughly, which person is which.

Whose turn. Always whose, because turn is a noun being possessed.

Whose turn is it to present?

Who's there. Always who's, because it expands to who is there.

Who's there?

Whose fault. Always whose, same reason as whose turn.

Whose fault was it?

The pattern is consistent with everything above. The fixed expressions are not exceptions; they just appear often enough that writers memorize them as units and then lose track of why they take the form they do.

14. Why spell check will not save you

There is a structural reason this particular pair stays difficult even for careful, experienced writers, and it is worth naming because it changes how you should proofread.

Both words are correctly spelled words. A spell checker has nothing to flag. Unlike a typo, a wrong choice here produces a perfectly legitimate English word in a position where a legitimate English word belongs. Grammar checkers catch some instances by analyzing the surrounding structure, but they miss the harder cases, and they occasionally flag correct usage.

They are perfect homophones. Both are pronounced the same. Reading your work aloud, which catches a remarkable range of other errors, gives you nothing at all here. Your ear cannot distinguish them because there is no difference to hear.

The combination means this is an error you have to catch with your eyes and with the structural rule, not with software or with sound. For documents that matter, the efficient method is a targeted pass: search the document for whos and check each result against the test, rather than hoping to notice in the course of ordinary reading.

15. The same mistake in three other pairs

Once the apostrophe logic from section 5 is clear, it resolves four confusions at once, because they are all the same confusion.

In each pair, the version with the apostrophe is a contraction with letters missing. The version without the apostrophe is an inherited possessive that never needed punctuation.

who's = who is / who has · whose = possessive it's = it is / it has · its = possessive you're = you are · your = possessive they're = they are · their = possessive (and there is the place word)

The parallel is exact, and the test is identical in all four cases: expand the contraction, and if the expansion is nonsense, drop the apostrophe.

It's raining. → It is raining ✓ The dog chewed its leash. → It is leash ✗ → so its

You're late. → You are late ✓ Is this your coat? → You are coat ✗ → so your

They're waiting outside. → They are waiting ✓ Their car is in the shop. → They are car ✗ → so their

If you can run this test in one pair, you can run it in all four. These are not four rules. They are one rule, applied four times.

16. Practice exercises with answers

Exercise 1: Choose the correct word

1. ______ bringing the dessert?
2. The professor ______ lecture we attended has written six books.
3. Do you know ______ in charge of scheduling?
4. I found a wallet, but I'm not sure ______ it is.
5. Anyone ______ interested should sign up by Friday.
6. She's the colleague ______ recommendation got me the interview.
7. ______ been using the conference room all morning?
8. They hired a firm ______ reputation is excellent.
9. ______ turn is it to drive?
10. He's the only one ______ read the whole report.

Answers

1. Who's (Who is bringing)
2. whose (the lecture belonging to the professor; a noun follows)
3. who's (who is in charge)
4. whose (belonging to whom)
5. who's (who is interested; an adjective follows)
6. whose (the recommendation belonging to the colleague)
7. Who's (Who has been using)
8. whose (the reputation belonging to the firm; note that a firm is not a person, and this is still standard)
9. Whose (a noun follows)
10. who's (who has read)

Exercise 2: Correct the error

Each sentence contains one mistake.

1. Whose coming to the game on Saturday?
2. The company who's revenue doubled is hiring.
3. I don't know who's laptop this is.
4. She's the candidate whose been endorsed by the mayor.
5. Who's responsibility is it to lock up?
6. Let me know whose available for a call.
7. The restaurant who's chef won the award is fully booked.
8. Do you remember whom's turn it was?

Answers

1. Who's coming (who is coming)
2. The company whose revenue doubled (the revenue belonging to the company)
3. I don't know whose laptop this is (belonging to whom)
4. the candidate who's been endorsed (who has been endorsed)
5. Whose responsibility is it (a noun follows)
6. Let me know who's available (who is available)
7. The restaurant whose chef won the award (the chef belonging to the restaurant)
8. Do you remember whose turn it was (whom's does not exist in any context)

Exercise 3: Expand the contraction

For each sentence, write out what who's stands for. Two of these are incorrect as written. Find them.

1. Who's seen the latest draft?
2. Who's the project manager on this account?
3. Who's a spare charger?
4. Who's been assigned to the audit?
5. Who's car is in my space?
6. Who's willing to stay late?

Answers

1. Who has seen the latest draft. Correct.
2. Who is the project manager. Correct.
3. Incorrect. The writer means who has a spare charger, but has here is a main verb meaning possesses, and it cannot contract this way. Write Who has a spare charger? or Who's got a spare charger?
4. Who has been assigned. Correct.
5. Incorrect. This should be Whose car is in my space? A noun follows, and nothing is being contracted.
6. Who is willing to stay late. Correct.

Exercise 4: Things, not people

Decide whether each sentence is standard English. If it is not, fix it.

1. This is the policy whose wording caused the dispute.
2. Whose screen is cracked?
3. We're reviewing a proposal whose budget seems unrealistic.
4. Whose pages are missing?
5. The bridge whose supports were replaced reopened last month.

Answers

1. Standard. Inanimate whose in a relative clause is accepted by every major modern authority.
2. Not standard if you mean a device. A direct question with whose asks about a person. Rewrite as Which screen is cracked? It is fine if you genuinely mean "which person's screen."
3. Standard.
4. Not standard if you mean a book. Rewrite as Which book is missing pages?
5. Standard.

17. Frequently asked questions

What is the difference between who's and whose? Who's is a contraction of who is or who has. The apostrophe marks the letters that were removed. Whose is a possessive, meaning belonging to whom. The quickest check is to substitute who is or who has; if the sentence still works, use who's.

Is it "whose coming" or "who's coming"? Who's coming. The sentence means who is coming, so the contraction is correct. A useful signal: coming is a verb, and whose attaches to nouns, not verbs.

Can who's mean "who has"? Yes, but only when has is an auxiliary verb forming a perfect tense, as in Who's finished? or Who's seen my keys? It cannot stand in for has meaning possesses. Who's a pen? does not mean who has a pen; you have to write Who has a pen? or Who's got a pen?

Why doesn't whose have an apostrophe if it shows possession? Because the apostrophe only arrived in English in the sixteenth century, and whose is far older. It descends from an Old English possessive form and was already complete before the punctuation mark existed. The apostrophe was introduced to mark possession on nouns, which had no dedicated possessive form. Pronouns such as whose, his, her, its, and their never needed one.

Can whose refer to things, or only to people? It can refer to things. Which and that have no possessive forms, so whose has filled that gap since at least 1479, appearing in Shakespeare, Milton, the King James Bible, Austen, and Fitzgerald. Merriam-Webster's Dictionary of English Usage calls the prohibition against it a superstition, and the Cambridge Grammar of the English Language, The Chicago Manual of Style, and Bryan Garner all accept it.

Is there any situation where whose cannot refer to a thing? Yes, one. In a direct question, whose always refers to a person. Whose pages are torn? asks which person the pages belong to, not which book. For a thing, ask Which book has torn pages? The inanimate use is limited to relative clauses.

Should I use "of which" instead of whose? Usually not. Of which is grammatical but noticeably heavier, and Merriam-Webster describes it as frequently clumsy or stilted. It suits formal or literary prose. In most writing, whose is lighter and reads better, and rewriting to drop the possessive entirely (the car with the cracked windshield) is often the best option of the three.

Is "whom's" ever correct? No. It is not a word. Whom has no possessive form, so possession is handled by whose for both who and whom. And whom is an object pronoun, so it cannot be the subject of is or has, which means there is no whom is to contract.

Is "who's who" correct? Yes, exactly as written. The phrase expands to who is who, and it means either a directory of notable people or the identities of people in a group. Both words are correct, and the apostrophe belongs on the first one.

Why do I keep making this mistake even though I know the rule? Because neither of your usual proofreading tools helps. Both words are correctly spelled, so spell check has nothing to flag, and both are pronounced identically, so reading aloud gives you no signal. The error also clusters in the middle of sentences, inside relative clauses, where writers stop thinking of the word as a question word. The reliable fix is a targeted search for whos in your document, checking each instance against the substitution test.

18. Sources

• Merriam-Webster, Using "Whose" for Objects and Things — the gap in English possessives, the documented history of inanimate whose, and the interrogative exception
• Merriam-Webster's Dictionary of English Usage, Merriam-Webster — the status of inanimate whose as standard and the characterization of the prohibition
• Rodney Huddleston and Geoffrey K. Pullum, The Cambridge Grammar of the English Language (2002), Cambridge University Press — the grammatical status of whose as a determiner and of inanimate genitives
• Bryan A. Garner, Garner's Modern English Usage, Oxford University Press — guidance on inanimate whose and on of which
• The Chicago Manual of Style, University of Chicago Press — acceptance of whose with non personal antecedents
• H. W. Fowler, A Dictionary of Modern English Usage (1926), Oxford University Press — the original attack on the prohibition
• Sir Ernest Gowers, The Complete Plain Words (1954) — the assessment of the rule as cramping
• Oxford English Dictionary — the etymology of whose from Old English hwæs, and Henry Bradley's note on of which
• Cambridge Dictionary, Grammar — entries on whose, relative clauses, and contractions