Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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