Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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