United Nations. Department of International Economic and Social Affairs. (1989). Global estimates and projections of population by sex and age: The 1988 revision. United Nations.
Citace podle Chicago (17th ed.)United Nations. Department of International Economic and Social Affairs. Global Estimates and Projections of Population by Sex and Age: The 1988 Revision. New York: United Nations, 1989.
Citace podle MLA (9th ed.)United Nations. Department of International Economic and Social Affairs. Global Estimates and Projections of Population by Sex and Age: The 1988 Revision. United Nations, 1989.
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