APA (7th ed.) Citation

Ehrlich, P. R., & Ehrlich, A. H. (1970). Population, resources, environment : issues in human ecology / Paul R. Ehrlich, Anne H.Ehrlich: Issues in human ecology. W.H. Freeman.

Chicago Style (17th ed.) Citation

Ehrlich, Paul R., and Anne H. Ehrlich. Population, Resources, Environment : Issues in Human Ecology / Paul R. Ehrlich, Anne H.Ehrlich: Issues in Human Ecology. San Francisco: W.H. Freeman, 1970.

MLA (9th ed.) Citation

Ehrlich, Paul R., and Anne H. Ehrlich. Population, Resources, Environment : Issues in Human Ecology / Paul R. Ehrlich, Anne H.Ehrlich: Issues in Human Ecology. W.H. Freeman, 1970.

Warning: These citations may not always be 100% accurate.