Cita APA (7th ed.)

Freeman, A. M., & Ethoven ,Alain C. (1973). Pollution, resources, and the environment. Norton.

Cita Chicago (17th ed.)

Freeman, A. Myrick, i Ethoven ,Alain C. Pollution, Resources, and the Environment. New York: Norton, 1973.

Cita MLA (9th ed.)

Freeman, A. Myrick, i Ethoven ,Alain C. Pollution, Resources, and the Environment. Norton, 1973.