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
"The Edinburgh Review: Or Critical Journal, vol. 111". Journal by Sydney Smith, Lord Francis Jeffrey Jeffrey, William Empson, Macvey Napier, Sir George Cornewall Lewis, Henry Reeve, Arthur Ralph Douglas Elliot (Hon.), Harold Cox, p. 494, 1860.