
Defernatly the book of the bitch.
I got it when I first got me girl mainly as a refresher on seasons (I had not planned to getting a female) later on when we were thinking of breeding I also pinched two more books from my friend, breeding dogs for dummies and another one I can't rember the title but to be honist all the info that was in those two books were in the book of the bitch and the book of the bitch had extra info and diagrams for stuff those two books didn't have.