Cita APA

Ehrlich, A. H., & Ehrlich, P. R. (1987). Earth. Thames Methuen.

Citación estilo Chicago

Ehrlich, Anne H., and Paul R. Ehrlich. Earth. London: Thames Methuen, 1987.

Cita MLA

Ehrlich, Anne H., and Paul R. Ehrlich. Earth. Thames Methuen, 1987.

Warning: These citations may not always be 100% accurate.