APA (7th ed.) Citation

Ehrlich, A. H., & Ehrlic, P. R. (1987). Earth. Methun.

Chicago Style (17th ed.) Citation

Ehrlich, Anne H., and Paul R. Ehrlic. Earth. London: Methun, 1987.

MLA (9th ed.) Citation

Ehrlich, Anne H., and Paul R. Ehrlic. Earth. Methun, 1987.