Question

What is the possessive form of "books"?

Answer 1

The possessive form of "books" is books'

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

Answer 2

Books has no possessive form as this form is used only for living beings and expressions of time,distance.
You say the cover of the book not the book's cover
Different from
The boy's book not the book of the boy,