|1.||The possessive pronouns—its, hers, his, ours, yours, theirs—do not use an apostrophe.|
|2.||The possessive of plural nouns ending in "s" is formed by adding an apostrophe: 10 days' trial.|
|3.||Joint possession is indicated by adding an apostrophe and an "s" to the last noun only: Ben and Jerry's Ice Cream. To indicate separate possession, add the apostrophe and an "s" to each noun: Ben's and Jerry's ice cream cones.|
|4.||Add an "s" with no apostrophe to form the plurals of letters, nouns, numbers, and abbreviations, if it is possible to do so without causing confusion: several YWCAs and YMHAs; in the 1960s; in fours and fives.|
|5.||Add an apostrophe and an "s" to form the plurals of lowercase letters used as nouns, abbreviations using periods, and capital letters that would otherwise be confusing: C.P.A.'s; a's and b's; I's, A's, U's.|
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Publication information: Book title: The AMA Handbook of Business Letters. Contributors: Jeffrey L. Seglin - Author, Edward Coleman - Author. Publisher: AMACOM. Place of publication: New York. Publication year: 2002. Page number: 471.
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