APA (7th ed.) Citation

Pirages, D. C., & Ehrlich, P. R. (1974). Ark II: Social response to environmental imperatives. Freeman.

Chicago Style (17th ed.) Citation

Pirages, Dennis C., and Paul R. Ehrlich. Ark II: Social Response to Environmental Imperatives. San Francisco: Freeman, 1974.

MLA (9th ed.) Citation

Pirages, Dennis C., and Paul R. Ehrlich. Ark II: Social Response to Environmental Imperatives. Freeman, 1974.