Não informado. (1891). Contributions fron the Department of Botany and Rocky Mountain Herbarium. University of Wyoming.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Contributions Fron the Department of Botany and Rocky Mountain Herbarium. Laramie, Wyo: University of Wyoming, 1891.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Contributions Fron the Department of Botany and Rocky Mountain Herbarium. University of Wyoming, 1891.
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