Não informado. (1939). Contributions from the University of Michigan Herbarium. University of Michigan Herbarium.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Contributions from the University of Michigan Herbarium. Ann Arbor, Mich: University of Michigan Herbarium, 1939.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Contributions from the University of Michigan Herbarium. University of Michigan Herbarium, 1939.
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