Não informado. (1939). Biological abstracts. Union of American Biological Societies.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Biological Abstracts. Philadelphia, Pa: Union of American Biological Societies, 1939.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Biological Abstracts. Union of American Biological Societies, 1939.
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