Cita APA

Simmons, I. G. (1981). ecology of natural resources (2nd ed.). English Language Book Society.

Chicago Edition Citation

Simmons, I G. Ecology of Natural Resources. 2nd ed. London: English Language Book Society, 1981.

Cita MLA

Simmons, I G. Ecology of Natural Resources. 2nd ed. English Language Book Society, 1981.