United Nations. Department for Economic and Social Affairs. World population prospects 1990. New York: United Nations, 1991. xiii, 607 s. Population studies; no. 120.
Department of International Economic and Social Affairs. (1991). World population prospects 1990. New York: United Nations.
Styl ChicagoDepartment of International Economic and Social Affairs. World Population Prospects 1990. New York: United Nations, 1991.
Citace podle MLADepartment of International Economic and Social Affairs. World Population Prospects 1990. New York: United Nations, 1991.
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