Não informado. (1939). Bulletin of the Oxford University Institute of Statistics. Oxford University Institute of Statistics.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Bulletin of the Oxford University Institute of Statistics. Oxford, Inglaterra: Oxford University Institute of Statistics, 1939.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Bulletin of the Oxford University Institute of Statistics. Oxford University Institute of Statistics, 1939.
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