Não informado. (1951). Population Bulletin of the United Nations. United Nations, Population Division.
Lua i Stíl Chicago (17ú heag.)Não informado. Population Bulletin of the United Nations. New York: United Nations, Population Division, 1951.
Lua MLA (8ú heag.)Não informado. Population Bulletin of the United Nations. United Nations, Population Division, 1951.
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