Cita APA (7th ed.)

Zim, H. S., & Smith, H. M. (1956). Reptiles and amphibians: A guide to familiar american species. Simons and Schuster.

Cita Chicago (17th ed.)

Zim, Herbert S., i Hobart M. Smith. Reptiles and Amphibians: A Guide to Familiar American Species. Nueva York: Simons and Schuster, 1956.

Cita MLA (9th ed.)

Zim, Herbert S., i Hobart M. Smith. Reptiles and Amphibians: A Guide to Familiar American Species. Simons and Schuster, 1956.