APA (7th ed.) Citation

Gans, C., Bellairs, A. d., & Parsons, T. S. (1969). Biology of the reptilia. Academic Press.

Chicago Style (17th ed.) Citation

Gans, Carl, Angus d'A Bellairs, and Thomas S. Parsons. Biology of the Reptilia. London [etc.]: Academic Press, 1969.

MLA (9th ed.) Citation

Gans, Carl, et al. Biology of the Reptilia. Academic Press, 1969.