Cita APA

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

Citación estilo Chicago

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

Cita MLA

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