Cita APA (7a ed.)

Ehrlich, P. R., Ehrlich, A. H., & Holdren, J. P. (1977). Ecoscience: Population resources, environment. W. H. Freeman.

Cita Chicago Style (17a ed.)

Ehrlich, Paul R., Anne H. Ehrlich, y John P. Holdren. Ecoscience: Population Resources, Environment. San Francisco: W. H. Freeman, 1977.

Cita MLA (8a ed.)

Ehrlich, Paul R., et al. Ecoscience: Population Resources, Environment. W. H. Freeman, 1977.