Hillstrom, Laurie Collier (2016). The Lewis and Clark Expedition. Detroit, MI. p. 38. ISBN9780780814172. OCLC910987428.{{cite book}}: CS1 maint: location missing publisher (link)
Elin., Woodger (2004). Encyclopedia of the Lewis and Clark Expedition. Toropov, Brandon. New York: Facts On File. p. 193. ISBN0816047812. OCLC51900390.
