Gass, P. (1958). A journal of the voyages and travels of a corps of discovery: Under the command of Capt. Lewis and Capt. Clark of the Army of the United States, from the mouth of the River Missouri through the interior parts of North America to the Pacific Ocean, during the years 1804, 1805 and 1806. Ross and Haines.
Chicago Style (17th ed.) CitationGass, Patrick. A Journal of the Voyages and Travels of a Corps of Discovery: Under the Command of Capt. Lewis and Capt. Clark of the Army of the United States, from the Mouth of the River Missouri Through the Interior Parts of North America to the Pacific Ocean, During the Years 1804, 1805 and 1806. Minneapolis: Ross and Haines, 1958.
MLA (8th ed.) CitationGass, Patrick. A Journal of the Voyages and Travels of a Corps of Discovery: Under the Command of Capt. Lewis and Capt. Clark of the Army of the United States, from the Mouth of the River Missouri Through the Interior Parts of North America to the Pacific Ocean, During the Years 1804, 1805 and 1806. Ross and Haines, 1958.