Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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