Friedman, D., & Butz, W. P. (1972). Laissez-faire in population: The least bad solution.
Dyfyniad Arddull ChicagoFriedman, David, and William P. Butz. Laissez-faire in Population: The Least Bad Solution. New York Population Council, 1972.
Dyfyniad MLAFriedman, David, and William P. Butz. Laissez-faire in Population: The Least Bad Solution. 1972.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.