There are several good ones out there. I would start with vol. 1 of the Traditional Bowyer's Bible, or get all four if you can. Some other good ones are Bows and Arrows of the Native Americans by Jim Hamm, The Bent Stick by Paul Comstock, and Hunting the Osage Bow by Dean Torges. There are many more out there, but those are some of the ones that have helped me out the most over the years.