United Nations. Department of Economic and Social Affairs. Population Division. (2007). World population ageing 2007. United Nations, Department of Economic and Social Affairs, Population Division.
Chicago-Zitierstil (17. Ausg.)United Nations. Department of Economic and Social Affairs. Population Division. World Population Ageing 2007. New York: United Nations, Department of Economic and Social Affairs, Population Division, 2007.
MLA-Zitierstil (9. Ausg.)United Nations. Department of Economic and Social Affairs. Population Division. World Population Ageing 2007. United Nations, Department of Economic and Social Affairs, Population Division, 2007.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.