Não informado. (1918). Bulletin of the Biological Society of Washington. Biological Society of Washington.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Bulletin of the Biological Society of Washington. Washington: Biological Society of Washington, 1918.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Bulletin of the Biological Society of Washington. Biological Society of Washington, 1918.
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