Krebs, J. R. (1981). An Introduction to Behavioural Ecology. Blackwell Scientific.
Lua i Stíl Chicago (17ú heag.)Krebs, J. R. An Introduction to Behavioural Ecology. Oxford: Blackwell Scientific, 1981.
Lua MLA (9ú heag.)Krebs, J. R. An Introduction to Behavioural Ecology. Blackwell Scientific, 1981.
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