Join a training club, and a breed club. Get to know the people and the dogs. Almost all of my books are pre-1990, I am sure there are probably better ones out there, but they are not easy to find.
I still drag out the strickland/moses book The German Shepherd Today at times.
There is another, the German Shepherd a genetic history, I think that has good descriptions of a lot of dogs as well as good information on how diseases like hemophia are passed.
I tend to read/collect books by various trainers as well.
Heidi Ho, Odie
Joy-Joy, Bear Cub, Hepsi-Pepsi
Cujo2, Karma Chameleon
Ramona the Pest, Kojak -- who loves you baby?
Tiny Tinnie, Susie's Uzzi, Kaiah -- The Baby Monster.