Não informado. (1947). Monthly Bulletin of Statistics. United Nations, Department of Economic and Social Affairs, Statistical Office.
Chicago-referens (17:e uppl.)Não informado. Monthly Bulletin of Statistics. New York: United Nations, Department of Economic and Social Affairs, Statistical Office, 1947.
MLA-referens (8:e uppl.)Não informado. Monthly Bulletin of Statistics. United Nations, Department of Economic and Social Affairs, Statistical Office, 1947.
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