Stefan Broghammer has written some, they are good, only a bit hard to get:

http://www.ms-reptilien.de/product_i...ducts_id=21498

http://www.ms-reptilien.de/product_i...ducts_id=26303

also the thing with genetics is that its the same for any sexually reproducing species. so here any introductory book on genetics for students can be helpful.

many books about ball pythons cover morphs, husbandry, breeding, and some genetics, but if you are not satisfied with the genetics these BP-specific books deliver, go straight to genetics in general.