APA (7e ed.) Bronvermelding

Ehrlich, P., & Ehrlich, A. H. (1972). Population, resources, environment: Issues in human ecology. W. H. Freeman.

Chicago (17e ed.) Bronvermelding

Ehrlich, Paul, en Anne H. Ehrlich. Population, Resources, Environment: Issues in Human Ecology. San Francisco: W. H. Freeman, 1972.

MLA (9e ed.) Bronvermelding

Ehrlich, Paul, en Anne H. Ehrlich. Population, Resources, Environment: Issues in Human Ecology. W. H. Freeman, 1972.