Não informado. (1891). Contributions from the Gray Herbarium of Harvard University. Harvard University.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Contributions from the Gray Herbarium of Harvard University. Cambridge, Mass: Harvard University, 1891.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Contributions from the Gray Herbarium of Harvard University. Harvard University, 1891.
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