Contributions from the United States National Herbarium. Department of Botany, Smithsonian Institution.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रContributions from the United States National Herbarium. Department of Botany, Smithsonian Institution.
एमएलए (9वां संस्करण) प्रशस्ति पत्रContributions from the United States National Herbarium. Department of Botany, Smithsonian Institution.
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