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"The Complete Plain Words" by Ernest Gowers is always worth having on the bookshelf for situation like this ...

You always put the apostrophe at the end of the word and the s after that, but if there is already an s at the end of the word you can leave it off. So if the word ends in s (including plurals) just an ', if it doesn't then add 's.

For Example: The boy's ball was lost. (One boy owned a ball which was lost) The boys' ball was lost. (More than one boy owned a ball which was lost)

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