Ridker, R. G. (1972). Population resources, and the environment. Government Printing Office.
Citace podle Chicago (17th ed.)Ridker, Ronald Gene. Population Resources, and the Environment. Washington, D.C: Government Printing Office, 1972.
Citace podle MLA (9th ed.)Ridker, Ronald Gene. Population Resources, and the Environment. Government Printing Office, 1972.
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