APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Simmons, I. G. The Ecology of Natural Resources. 2a. ed. Londres: Edward Arnold, 1981.

MLA (9th ed.) Citation

Simmons, I. G. The Ecology of Natural Resources. 2a. ed. Edward Arnold, 1981.