I'm going to have to agree with solon on this one, I really don't see any draft in him. This book focuses more on the team and driving aspects of owning but I thought it was interesting.
Draft Horses and Mules, Storey's Working Animal Ser., Gail Damerow, Book - Barnes & Noble
I have no idea what this one is about but it looks interesting.
Horsepower, Cris Peterson, Book - Barnes & Noble
Other than when they mature, I have found that my Percheron stud is no different than any other horse that I have messed with. He eats a little more and needs bigger shoes but he still learns the same way. He kinda learns faster because he is very laid back and mellow.