United Nations Department of International Economic and Social Affairs. (1990). Results of the sixth population inquiry among governments. United Nations.
Παραπομπή σε μορφή Chicago (17η εκδ.)United Nations Department of International Economic and Social Affairs. Results of the Sixth Population Inquiry Among Governments. New York: United Nations, 1990.
Παραπομπή σε μορφή MLA (8th εκδ.)United Nations Department of International Economic and Social Affairs. Results of the Sixth Population Inquiry Among Governments. United Nations, 1990.
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