Dyfyniad APA

(1957). Background facts on world population and population trends. United Nations.

Dyfyniad Arddull Chicago

Background Facts on World Population and Population Trends. New York: United Nations, 1957.

Dyfyniad MLA

Background Facts on World Population and Population Trends. United Nations, 1957.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.