Wendell Phillips (1859). “Fraternity Lecture of Wendell Phillips, Esq: Boston, Oct. 4, 1859. Also, Letter of Mr. Phillips to Judge Shaw and Prest. Walker”, p.6
Samuel George Morton, George Combe (1839). “Crania Americana; Or, A Comparative View of the Skulls of Various Aboriginal Nations of North and South America: To which is Prefixed an Essay on the Varieties of the Human Species”, p.7, Philadelphia : J. Dobson ; London : Simpkin, Marshall
William Shirley, National Society of the Colonial Dames of America (1973). “Correspondence of William Shirley, Governor of Massachusetts and military commander in America, 1731-1760”
Henry Walter Bates (1864). “The Naturalist on the River Amazons: A Record of Adventures, Habits of Animals, Sketches of Brazilian and Indian Life, and Aspects of Nature Under the Equator, During Eleven Years of Travel”, p.23