APA (7th ed.) Citation

Ehrlich, A. H., & Ehrlich, P. R. (1987). Earth. Franklin Watts.

Chicago Style (17th ed.) Citation

Ehrlich, Anne H., and Paul R. Ehrlich. Earth. New York: Franklin Watts, 1987.

MLA (9th ed.) Citation

Ehrlich, Anne H., and Paul R. Ehrlich. Earth. Franklin Watts, 1987.