APA Edition Citation

Ehrlich, P. R. E. (1970). Population resources environment: Issues in human ecology.

Chicago Edition Citation

Ehrlich, Paul R; Ehelich. Population Resources Environment: Issues in Human Ecology. W H Freeman & Co., San Francisco, 1970.

MLA Edition Citation

Ehrlich, Paul R; Ehelich. Population Resources Environment: Issues in Human Ecology. 1970.