Lua APA (7ú heag.)

United Nations. Department of International Economic and Social Affairs. (1982). World population trends and policies, 1981 monitoring report. United Nations.

Lua i Stíl Chicago (17ú heag.)

United Nations. Department of International Economic and Social Affairs. World Population Trends and Policies, 1981 Monitoring Report. New York: United Nations, 1982.

Lua MLA (9ú heag.)

United Nations. Department of International Economic and Social Affairs. World Population Trends and Policies, 1981 Monitoring Report. United Nations, 1982.

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