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
James Boswell, Samuel Johnson, Edmond Malone (1824). “The life of Samuel Johnson, LL. D., comprehending an account of his studies, and numerous works, in chronological order: a series of his epistolary correspondence and conversations with many eminent persons; and various original pieces of his composition, never before published; the whole exhibiting a view of literature and literary men in Great Britain, for near half a century during which he flourished”, p.373