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(Note: Conventions discussed in this section are based on the 14th edition of The Chicago Manual of Style and the 3rd edition of Words into Type.)
3.1.1 Use an apostrophe to indicate possession. Add an apostrophe plus s to singular nouns and indefinite pronouns to form the possessive.
EXAMPLES
Fire destroyed the company’s data processing room.
The physician examined everyone’s medical records.
Add an apostrophe plus s to plural nouns that do not end in s. Add only the apostrophe to plurals that end in s:
EXAMPLES
women’s locker room (locker room of the women)
schooners’ crews (crews of more than one schooner)
3.1.2 Use an apostrophe to indicate omission of one or more letters or figures.
EXAMPLES
doesn’t = does not
‘ 01 = 2001
3.1.3 Avoid a common misuse that confuses it’s (it is) and its (possessive form of it), you’re (you are) and your (possessive form of you). Do not use apostrophes with such possessive pronouns as hers, theirs, or ours.