Não informado. (1841). Proceedings of the Academy of Natural Sciences of Philadelphia. Academy of Natural Sciences of Philadelphia.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Proceedings of the Academy of Natural Sciences of Philadelphia. Philadelphia, Pa: Academy of Natural Sciences of Philadelphia, 1841.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Proceedings of the Academy of Natural Sciences of Philadelphia. Academy of Natural Sciences of Philadelphia, 1841.
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