Cita APA

Parker, H. W. (1977). Snakes a natural history (2a. ed.). Ithaca: Cornell University.

Citación estilo Chicago

Parker, H. W. Snakes a Natural History. 2a. ed. Ithaca: Cornell University, 1977.

Cita MLA

Parker, H. W. Snakes a Natural History. 2a. ed. Ithaca: Cornell University, 1977.