What would be the weapon stats be for books? I figure that the damage would be 1d4 for small books/1d6 for medium sized books & 1d8 for large sized books. I could be wrong though, I just want to be sure.
A book used as a weapon would use the normal rules for improvised weapons. As the rule says, damage is based on judgement and comparing to existing weapons. (There are other details of course — best to read the rule to get the full picture.)
Since few books are large enough to compare to a longsword and still be light enough to use as a weapon (or even as a book), likely the most damage even a “large” book would do would be 1d4 — comparable to a club. Perhaps even 1d4 nonlethal (as a sap).
In the Complete Warrior (page 159) there is a table which state the damage dice of improvised weapon by their weight.
I prefer this rule instead of comparing with existing weapon for anything that is made of unusual material (at least for weapon) or which don't really look like a weapon.
One of our small books, lightweight and paperback, should do 1d3 non lethal.
A big wizard spellbook, weighting 3 lbs. and hardcover, should do 1d4 lethal damage.