APA (7th ed.) Citation

(1989). World population at the turn of the century. United Nations, Dep. of Internat. Economic and Social Affairs.

Chicago Style (17th ed.) Citation

World Population at the Turn of the Century. New York: United Nations, Dep. of Internat. Economic and Social Affairs, 1989.

MLA (9th ed.) Citation

World Population at the Turn of the Century. United Nations, Dep. of Internat. Economic and Social Affairs, 1989.

Warning: These citations may not always be 100% accurate.