Friedman, D., & Butz, W. P. (1972). Laissez-faire in population: The least bad solution.
Čikaški stil citiranja (17. izdanje)Friedman, David, i William P. Butz. Laissez-faire in Population: The Least Bad Solution. New York Population Council, 1972.
MLA način citiranja (9. izdanje)Friedman, David, i William P. Butz. Laissez-faire in Population: The Least Bad Solution. 1972.
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