Citazione Stile APA (7a Edizione)

Ehrlich, P. R., & Ehrlich, A. H. (1970). Population Resources Environment: Issues in Human Ecology. W. H. Freeman and Company.

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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