Davis, K., & Bernstam, M. S. (1991). Resources, environment, and population: Present knowledge, future options. Population Council : Oxford University Press.
Dyfyniad Arddull ChicagoDavis, Kingsley, and Mikhail S. Bernstam. Resources, Environment, and Population: Present Knowledge, Future Options. New York: Population Council : Oxford University Press, 1991.
Dyfyniad MLADavis, Kingsley, and Mikhail S. Bernstam. Resources, Environment, and Population: Present Knowledge, Future Options. Population Council : Oxford University Press, 1991.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.