This is a brilliant little book! It is about training using positive reinforcement - for specific bahavioral problems. All of the training books I have read mention the problems of Biting, Screaming, Over Bonding, and Feather Picking, but this book is specifically about those specific behaviors. Even if you don't want to do trick training, you need to know about these behaviors and how to use positive reinforcement to diminish them.
Good Bird! is easy to read and has lots of pictures. It is only about 80 pages long and can be read in a short time. It is definitely on my list of essential parrot training books.