APA (7th ed.) Citation

Smith, R. L. (1986). Elements of ecology (2nd ed.). Harper & Row.

Chicago Style (17th ed.) Citation

Smith, Robert Leo. Elements of Ecology. 2nd ed. New York: Harper & Row, 1986.

MLA (9th ed.) Citation

Smith, Robert Leo. Elements of Ecology. 2nd ed. Harper & Row, 1986.