* Zug, George R.; Vitt, Laurie J. (2001). ''Herpetology : an introductory biology of amphibians and reptiles''. Academic Press. pp. 630. ISBN 012782622X | * Zug, George R.; Vitt, Laurie J. (2001). ''Herpetology : an introductory biology of amphibians and reptiles''. Academic Press. pp. 630. ISBN 012782622X |