Não informado. (1947). Monthly Bulletin of Statistics. United Nations, Department of Economic and Social Affairs, Statistical Office.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Monthly Bulletin of Statistics. New York: United Nations, Department of Economic and Social Affairs, Statistical Office, 1947.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Monthly Bulletin of Statistics. United Nations, Department of Economic and Social Affairs, Statistical Office, 1947.
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