Randi Given's, Eight Ball Bible is in my opinion the best on the subject.
I sells it on my website, and I sells lots of 'em.
Beard
Edit, Edit, and retraction:
I regret the above declaration since I havent even read any other 8 ball books. Plus i made kind of an outrageous claim (which I have since deleted and removed) that was probably demeaning to the other 8 ball book authors. Phil Capelle took offense and rightly so. It is my understanding that he has a great line of instructional books. I still stand behind Randi's Eight Ball Bible as a terrific instructional tome, but he aint the only guy on the block.