APA (7th ed.) Citation

Simmons, I. G. (1981). The ecology of natural resources (2nd ed.). Wiley.

Chicago Style (17th ed.) Citation

Simmons, I. G. The Ecology of Natural Resources. 2nd ed. New York: Wiley, 1981.

MLA (9th ed.) Citation

Simmons, I. G. The Ecology of Natural Resources. 2nd ed. Wiley, 1981.