Não informado. (1939). Advancement of Science. British Association for the Advancement of Science.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Advancement of Science. London: British Association for the Advancement of Science, 1939.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Advancement of Science. British Association for the Advancement of Science, 1939.
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