APA

Simmons I. G., . (1974). The ecology of natural resources. New York: Halsted Press.

Chicago

Simmons I G, . 1974. The ecology of natural resources. New York: Halsted Press.

Harvard

Simmons I. G., . (1974). The ecology of natural resources. New York: Halsted Press.

MLA

Simmons I G, . The ecology of natural resources. New York: Halsted Press. 1974.