Reptile and amphibian variants : colors, patterns, and scales by H. Bernard Bechtel.
This book has bibliographies at the end of each chapter. Bechtel has probably done half of the published genetics work in snakes.
Richard Zweifel did a piece about Cal kings in the Journal of Heredity in 1982.
Rich Ihle, et al., did a piece about salmon (AKA hypo) in the boa constrictor in the Journal of Heredity, in the May/June issue, 2000, I believe. There may be more info on his web site, salmonboa.com.
For learning the principles of genetics, try Elrod and Stansfield, Schaum's Introduction to Genetics. Used, PB copies of the latest edition (2002) go for $8. Best bang for the buck I know of in genetics texts. Trying to learn genetics from the herper web sites is equivalent to shooting yourself in the foot.
Hope this helps.
Paul Hollander