Cita APA (7a ed.)

Smith, R. L. (1976). The ecology of man: An ecosystem approach (2. ed.). Harper & Row.

Cita Chicago Style (17a ed.)

Smith, Robert Leo. The Ecology of Man: An Ecosystem Approach. 2. ed. New York [u.a.]: Harper & Row, 1976.

Cita MLA (8a ed.)

Smith, Robert Leo. The Ecology of Man: An Ecosystem Approach. 2. ed. Harper & Row, 1976.