Cita APA

Ehrlich, P. R. 1., Ehrlich, A. H. 1., & Holdren, J. P. (1973). Human ecology: Problems and solutions. San Francisco: W. H. Freeman and Company.

Citación estilo Chicago

Ehrlich, Paul Ralph 1932-, Anne Howland 1933- Ehrlich, y John P. Holdren. Human Ecology: Problems and Solutions. San Francisco: W. H. Freeman and Company, 1973.

Cita MLA

Ehrlich, Paul Ralph 1932-, Anne Howland 1933- Ehrlich, y John P. Holdren. Human Ecology: Problems and Solutions. San Francisco: W. H. Freeman and Company, 1973.