^Harvey Butchart, Grand Canyon Treks: A Guide to the Inner Canyon Routes, 1970, La Siesta Press, ISBN9780910856386, page 62.
^ abAaron Tomasi, Pernell Tomasi, Grand Canyon Summits Select An Obscure Compilation of Sixty-nine Remote Ascent Routes in the Grand Canyon National Park Backcountry, 2001, ISBN9780971088009, page 30.
^Peel, M. C.; Finlayson, B. L.; McMahon, T. A. (2007). "Updated world map of the Köppen−Geiger climate classification". Hydrol. Earth Syst. Sci. 11. ISSN1027-5606.
^Randy Moore and Kara Felicia Witt, The Grand Canyon: An Encyclopedia of Geography, History, and Culture, 2018, ABC-CLIO Publisher, page 151.
^Gregory McNamee, Grand Canyon Place Names, 1997, Mountaineers Publisher, ISBN9780898865332, page 50.
^John Annerino, Hiking the Grand Canyon, 1993, Sierra Club Books, page 73.
^N.H. Darton, Story of the Grand Canyon of Arizona, 1917.
^Noble, L. F., The Shinumo Quadrangle, Grand Canyon District, Arizona, Bulletin 549, United States Geological Survey, Department of the Interior, (Washington, D.C.: Government Printing Office, 1914), page 79.