United Nations. Department of International Economic and Social Affairs. (1992). Long-range world population projections: Two centuries of population growth, 1950-2150. United Nations.
Cita Chicago (17th ed.)United Nations. Department of International Economic and Social Affairs. Long-range World Population Projections: Two Centuries of Population Growth, 1950-2150. New York: United Nations, 1992.
Cita MLA (9th ed.)United Nations. Department of International Economic and Social Affairs. Long-range World Population Projections: Two Centuries of Population Growth, 1950-2150. United Nations, 1992.
Atenció: Aquestes cites poden no estar 100% correctes.