APA (7th ed.) Citation

Smith, R. L. (1972). The ecology of man: An ecosystem approach. Harper & Row.

Chicago Style (17th ed.) Citation

Smith, Robert Leo. The Ecology of Man: An Ecosystem Approach. New York: Harper & Row, 1972.

MLA (9th ed.) Citation

Smith, Robert Leo. The Ecology of Man: An Ecosystem Approach. Harper & Row, 1972.