Lewis, Meriwether, and Clark, William. The Journals of Lewis and Clark. Whitefish, Mont.: Kessinger Publishing, 2004. ISBN1-4191-6799-5 pp. 134–135. Punctuation and spelling as given here. See Google Books preview.
Mineral and Water Resources of Montana. Stermitz, Frank; Hanly, T. F.; and Lane, C. W. Special Publication No. 28. Helena, Mont.: Montana Bureau of Mines and Geology, May 1963.
"Great Falls Portage". National Historic Landmark summary listing. National Park Service. Archived from the original on 2011-06-06. Retrieved 2007-10-24.
Hill, Christopher L., and Valppu, Seppo H. "Geomorphic Relationships and Paleoenvironmental Context of Glaciers, Fluvial Deposits, and Glacial Lake Great Falls, Montana." Current Research in the Pleistocene. 14 (1997); Hill, Christopher L. "Pleistocene Lakes Along the Southwest Margin of the Laurentide Ice Sheet." Current Research in the Pleistocene. 17 (2000); Hill, Christopher L., and Feathers, James K. "Glacial Lake Great Falls and the Late-Wisconsin-Episode Laurentide Ice Margin." Current Research in the Pleistocene. 19 (2002); Reynolds, Mitchell W. and Brandt, Theodore R. Geologic Map of the Canyon Ferry Dam 30' x 60' Quadrangle, West-Central Montana: U.S. Geological Survey Scientific Investigations Map 2860, scale 1:100,000. Scientific Investigations Map 2860. Washington, D.C.: U.S. Geologic Survey, 2005.
"Great Falls Portage". National Historic Landmark summary listing. National Park Service. Archived from the original on 2011-06-06. Retrieved 2007-10-24.