− | * {{cite book | last = Zug | first = George R. | last2 = Vitt | first2 = Laurie J. | title = Herpetology : an introductory biology of amphibians and reptiles | publisher = Academic Press | pages = 630 | date= 2001 | isbn = 012782622X}} | + | * Zug, George R.; Vitt, Laurie J. (2001). ''Herpetology : an introductory biology of amphibians and reptiles''. Academic Press. pp. 630. ISBN 012782622X |