APA (7th ed.) Citation

Simmons, I. G. (1981). The Ecology of natural resources (2nd ed.). Edward Arnold.

Chicago Style (17th ed.) Citation

Simmons, Ian Gordon. The Ecology of Natural Resources. 2nd ed. London: Edward Arnold, 1981.

MLA (9th ed.) Citation

Simmons, Ian Gordon. The Ecology of Natural Resources. 2nd ed. Edward Arnold, 1981.