APA (7th ed.) Citation

United Nations. Department of Economic and Social Affairs. Population Division. (2010). World population ageing 2009. United Nations, Department of Economic and Social Affairs, Population Division.

Chicago Style (17th ed.) Citation

United Nations. Department of Economic and Social Affairs. Population Division. World Population Ageing 2009. New York, N.Y.: United Nations, Department of Economic and Social Affairs, Population Division, 2010.

MLA (9th ed.) Citation

United Nations. Department of Economic and Social Affairs. Population Division. World Population Ageing 2009. United Nations, Department of Economic and Social Affairs, Population Division, 2010.