The Complete Book of Shoulders and Arms: The Definitive Resource for Shaping and Strengthening the Shoulders and Arms
The big question I had, when I started reading this book, was whether we  really need to know what the distal radioulnar joint does (helps to supinate and pronate  forearms, dummy!) to understand how to build bigger arms and shoulders. Thankfully,  the sections that follow those on anatomy and kinesiology are more reader-friendly  and, consequently, more useful. The Brungardts, who separately and together have  produced books on abdominals and legs, here give an excellent introduction to  organized exercise. The focus is on shoulder and arm exercises--and there are plenty of  those--but the overall information on training techniques, diet and motivation is  indispensable.