Stebbins, R. C. Amphibians and Reptiles of Western North America. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Stebbins, Robert C. Amphibians and Reptiles of Western North America. McGraw-Hill.
Lua MLA (8ú heag.)Stebbins, Robert C. Amphibians and Reptiles of Western North America. McGraw-Hill.
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