Where does the possessive apostrophe go in Jones book?

The possessive apostrophe goes after the "s" in "Jones's book."

Here's why:

* Singular nouns ending in "s": You generally add an apostrophe and an "s" ('s) to form the possessive.

* Plural nouns ending in "s": You only add an apostrophe (') to form the possessive.

Since "Jones" is singular, the correct form is Jones's.