Cita APA (7th ed.)

Ehrlich, P. R., Holdren, J. P., & Holm, R. W. (1971). Man and the ecosphere. W. H. Freeman.

Cita Chicago (17th ed.)

Ehrlich, Paul R., John P. Holdren, i Richard W. Holm. Man and the Ecosphere. San Francisco: W. H. Freeman, 1971.

Cita MLA (9th ed.)

Ehrlich, Paul R., et al. Man and the Ecosphere. W. H. Freeman, 1971.