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My understanding of apostrophe usage for possessive forms of the word "user" is this:

Referring to a single user - user's.

Referring to multiple users - users'.

Is this correct? If not, what is? Links to authoritative references appreciated.

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closed as general reference by Bradd Szonye, Mitch, RegDwigнt May 21 '13 at 22:00

This question is too basic; it can be definitively and permanently answered by a single link to a standard internet reference source designed specifically to find that type of information.If this question can be reworded to fit the rules in the help center, please edit the question.

    
I see a "close as general reference" vote here. Help with a link, please? –  Iszi May 21 '13 at 21:33
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What references have you already checked? How are they unclear? Is there anything about user in particular that has you confused? –  Bradd Szonye May 21 '13 at 21:44
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Simply put, they're bizarrely wrong. Do they have any evidence for it? –  Bradd Szonye May 21 '13 at 23:08
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@BraddSzonye He showed me a #2 result on a Google search where the apostrophe was used in the way he thought was right. I don't recall what search terms he used, and I didn't recognize the site as something I would consider an authoritative source. But of course we know everyone on the Internet always uses proper grammar and punctuation. Thanks for the sanity check. –  Iszi May 22 '13 at 0:04