What is the possessive form of "books"?

The possessive form of "books" is books'

You just add an apostrophe after the s at the end of the word to show possession.

hancock was president of congress when the declaration of independence was adopted and signed. he is primarily remembered by americans for his large, flamboyant signature on the declaration, so much so that "john hancock" became, in the united states, an informal synonym for signature.

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