Não informado. (1933). Population. International Union for the Scientific Investigation of Population.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Population. London: International Union for the Scientific Investigation of Population, 1933.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Population. International Union for the Scientific Investigation of Population, 1933.
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