APA aipamena

Clapham, W. B. (1981). Human ecosystems. Macmillan.

Chicago Style aipamena

Clapham, Wentworth B. Human Ecosystems. New York: Macmillan, 1981.

MLA aipamena

Clapham, Wentworth B. Human Ecosystems. Macmillan, 1981.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.