I do not offhand know of any books that cohesively cover leo morphs. I do know you may be able to get more info online. There are some very good websites out there, including someone that had a genetic calculator function to give you your odds on crosses. Dont have a link for it tho, sorry. Morphs change often enough, and there is still considerable debate on some of it, as well as so much unknown, the internet may be more useful than texts. And of course, there is no substitute for talking to people and experiences.