Not exactly a book reccomendation, but I'm a bit of a science geek so I definitely ate up http://www.sunsetchinchillas.com/Genetics.shtml . They're very very through in detailing the science behind genetics when it comes to breeding in particular. I don't think they have complete punnet squares there, but they give you everything that you'd ever need to create your own, particularly if you're looking to breed a specific phenotype.
Drama--- I have actually looked at the same page and loved it as well! I have it saved to my favorites folder, LOL, with a thousand other chin links! Thanks