Não informado. (1891). Contributions fron the Department of Botany and Rocky Mountain Herbarium. University of Wyoming.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Contributions Fron the Department of Botany and Rocky Mountain Herbarium. Laramie, Wyo: University of Wyoming, 1891.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Contributions Fron the Department of Botany and Rocky Mountain Herbarium. University of Wyoming, 1891.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.