Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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