APA (7th ed.) Citation

Krebs, J. R. (1981). An Introduction to Behavioural Ecology. Blackwell Scientific.

Chicago Style (17th ed.) Citation

Krebs, J. R. An Introduction to Behavioural Ecology. Oxford: Blackwell Scientific, 1981.

MLA (9th ed.) Citation

Krebs, J. R. An Introduction to Behavioural Ecology. Blackwell Scientific, 1981.