APA (7th ed.) Citation

Ehrlich, P. R., & Ehrlich, A. H. (1990). The Population explosion. Simon and Schuster.

Chicago Style (17th ed.) Citation

Ehrlich, Paul R., and Anne H. Ehrlich. The Population Explosion. New York ; London: Simon and Schuster, 1990.

MLA (9th ed.) Citation

Ehrlich, Paul R., and Anne H. Ehrlich. The Population Explosion. Simon and Schuster, 1990.