APA (7th ed.) Citation

Krebs, J., N.B. Davis, & Parr, J. (1981). An introduction to behavioural ecology. Sinauer Associates.

Chicago Style (17th ed.) Citation

Krebs, J.R, N.B. Davis, and Jan Parr. An Introduction to Behavioural Ecology. Sunderland, Mass: Sinauer Associates, 1981.

MLA (9th ed.) Citation

Krebs, J.R, et al. An Introduction to Behavioural Ecology. Sinauer Associates, 1981.