Meriwether Lewis, William Clark, Thomas Rees (2010). “Travels to the Source of the Missouri River: And Across the American Continent to the Pacific Ocean 1804, 1805, and 1806”, p.213, Cambridge University Press
Meriwether Lewis (2012). “History of the Expedition under the Command of Captains Lewis and Clark, Vol. I. To the Sources of the Missouri, Thence Across the Rocky Mountains and Down the River Columbia to the Pacific Ocean. Performed During the Years 1804-5-6.”, p.229, tredition