Here's some bowmaking books I've read:

All three volumes of Traditional Bowyers Bible.

Hunting the Osage Bow by Dean Torges

Billets to Bows by Glenn St Charles

Bows and Arrows of the Native Americans by Jim Hamm

A couple of helpful websites:

The Ferret

George Tsoukalas

And a lot lot of good bow building links on the instruction page at Women Outdoors

And if you make your own bow, you might as well know how to make your own string so...

Flemish String Instructions

Have fun!