Cita APA (7th ed.)

ebrary, Inc, Mullin, S. J., & Seigel, R. A. (2009). Snakes: Ecology and conservation. Comstock Pub. Associates/Cornell University Press.

Cita Chicago (17th ed.)

ebrary, Inc, Stephen J. Mullin, i Richard A. Seigel. Snakes: Ecology and Conservation. Ithaca: Comstock Pub. Associates/Cornell University Press, 2009.

Cita MLA (9th ed.)

ebrary, Inc, et al. Snakes: Ecology and Conservation. Comstock Pub. Associates/Cornell University Press, 2009.