United Nations. Department of International Economic and Social Affairs. (1982). World population trends and policies, 1981 monitoring report. United Nations.
Chicago-referens (17:e uppl.)United Nations. Department of International Economic and Social Affairs. World Population Trends and Policies, 1981 Monitoring Report. New York: United Nations, 1982.
MLA-referens (9:e uppl.)United Nations. Department of International Economic and Social Affairs. World Population Trends and Policies, 1981 Monitoring Report. United Nations, 1982.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.