It has been several years since I've read these books but I found them touching, insightful, and sometimes hilarious. Mark Rashid is a master horseman and these books chronicle his learning curve from the beginning. You will see your's and other's mistakes through fresh eyes that look at things for the perspective of communicating with the horse. I love them and think that you will too.
Check out these titles:
Considering the Horse
A Good Horse is Never a Bad Color
Horses Never Lie
Life Lessons from a Ranch Horse