Meriwether Lewis, William Clark (1842). “History of the Expedition Under the Command of Captains Lewis and Clarke, to the Sources of the Missouri: Thence Across the Rockey Mountains, and Down the River Columbia to the Pacific Ocean ; Performed During the Years 1804, 1805, 1806, by Order of the Government of the United States”, p.146
Ralph Waldo Emerson, Robert Ernest Spiller, Alfred Riggs Ferguson, Joseph Slater, Jean Ferguson Carr (1971). “The Collected Works of Ralph Waldo Emerson: Nature, addresses, and lectures”, p.35, Harvard University Press