Não informado. (1891). Contributions fron the Department of Botany and Rocky Mountain Herbarium. University of Wyoming.
Chicago-Zitierstil (17. Ausg.)Não informado. Contributions Fron the Department of Botany and Rocky Mountain Herbarium. Laramie, Wyo: University of Wyoming, 1891.
MLA-Zitierstil (8. Ausg.)Não informado. Contributions Fron the Department of Botany and Rocky Mountain Herbarium. University of Wyoming, 1891.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.