Though I haven't read it, I've heard from multiple sources that The Complete Ball python is the best book. A little pricy though I'd say. You can see it here: http://www.amazon.com/Complete-Ball-...2466709&sr=8-1
RABERNET-you are right on the money. I have both book's and love both of them. I don't know how many times I bring one or the other back and forth to work all the time.
They both are. Seriously, I wouldn't want to be without either one of them.
But, perhaps this will help you. Which to buy first? Probably Kevin's book first. The Barker's book is much more detailed with the natural history of ball pythons included. So if you had to pick one, get Kevin's, then start saving your money for the Barkers.