Não informado. (1899). Proceedings of the Washington Academy of Sciences. Washington Academy of Sciences.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Proceedings of the Washington Academy of Sciences. Washington: Washington Academy of Sciences, 1899.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Proceedings of the Washington Academy of Sciences. Washington Academy of Sciences, 1899.
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