Não informado. (1930). Program of activities of the Chicago Academy of Sciences. Chicago Academy of Sciences.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Program of Activities of the Chicago Academy of Sciences. Chicago, Ill: Chicago Academy of Sciences, 1930.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Program of Activities of the Chicago Academy of Sciences. Chicago Academy of Sciences, 1930.
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