Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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