Cita APA

Ehrlich, P. R., Holdren, J. P., & Ehrlich, A. H. (1977). Ecoscience: Population, Resources, Environment. San Francisco: Freeman.

Citación estilo Chicago

Ehrlich, Paul R., J. P. Holdren, y A. H. Ehrlich. Ecoscience: Population, Resources, Environment. San Francisco: Freeman, 1977.

Cita MLA

Ehrlich, Paul R., J. P. Holdren, y A. H. Ehrlich. Ecoscience: Population, Resources, Environment. San Francisco: Freeman, 1977.