Cita APA (7th ed.)

Ridker, R. G. (1972). Population resources, and the environment. Government Printing Office.

Cita Chicago (17th ed.)

Ridker, Ronald Gene. Population Resources, and the Environment. Washington, D.C: Government Printing Office, 1972.

Cita MLA (9th ed.)

Ridker, Ronald Gene. Population Resources, and the Environment. Government Printing Office, 1972.