Simmons, I. G. (1974). The ecology of natural resources. Wiley.
Cita Chicago (17th ed.)Simmons, Ian Gordon. The Ecology of Natural Resources. New York: Wiley, 1974.
Cita MLA (9th ed.)Simmons, Ian Gordon. The Ecology of Natural Resources. Wiley, 1974.
Atenció: Aquestes cites poden no estar 100% correctes.