Agassiz, Louis. 1855. Sketch of the Natural Provinces of the Animal World and their Relations to the Different Types of Man. In Types of Mankind. Josiah Knot and George Gliddon, eds., Pp. lviii-lxxvi. Philadelphia: J. B. Lippencott – London: Trübner and Co.
Bachman, John. 1850. The Doctrine of the Unity of the Human Race. Charleston, SC: C. Canning.
Burke, Luke. 1848. Outlines of the Fundamental Doctrines of Ethnology. The Ethnological Journal June: 1–8.
Burke, Luke. 1848. Outlines of the Fundamental Doctrines of Ethnology (Continued from page 8). The Ethnological Journal August: 129–141.
Burke, Luke. 1848. Progress of Ethnology in the United States. The Ethnological Journal. September 1: 170–174.
Caldwell, Charles. 1830. Thoughts on the Original Unity of the Human Race. New York: E. Bliss.
Combe, Andrew. 1838. Remarks on the fallacy of Professor Tiedemann’s Comparison of the Negro Brain and Intellect with those of the European. The Phrenological Journal and Miscellany 9 [n. s. 1] (56):14–15.
Combe, George attributed. 1840. Crania Americana or a Comparative view of… folio 1839. The American Journal of Science and Arts 38: 356.
Combe, George, 1824. Elements of Phrenology, Edinburgh: J. Anderson, Jr. – London: Simpkin and Marshall, end plate.
Dr. Harlan’s Cabinet. 1838. The Boston Medical and Surgical Journal. 14 (14): 225.
Gliddon, George. 1849. Otia Aegyptiaca. London: James Madden.
Harlan, Richard. 1825. Fauna Americana: Being a Description of the Mammiferous Animals Inhabiting North America. Philadelphia: Anthony Finley.
Harlan, Richard. 1827. Description of an hermaphrodite Orang Outang lately living in Philadelphia. Read on October 17, 1826. Journal of the Academy of Natural Sciences of Philadelphia 5 (2): 229-236
Meigs, J. Aitkin. 1866. Observation upon the Cranial Forms of the American Aborigines. Proceedings of the Academy of Natural Sciences of Philadelphia, 18: 197–235.
Nott, Josiah and George Gliddon. 1845. Types of Mankind. Philadelphia: Lippincott, Grambo, and Company, Philadelphia.
Nott, Josiah and George Gliddon. 1857. Types of Mankind, 8th ed. Philadelphia: J. B. Lippencott – London: Trübner and Co.
Nott, Josiah, 1843. The Mulatto a Hybrid – Probable Extinction of the Two Races if the Whites and Blacks are Allowed in Intermarry. The American Journal of the Medical Sciences, 6:252-256.
Nott, Josiah. 1847. Statistics of the Southern Slave Population. The Commercial Review of the South and the West 4 (3): 275–287.
Nott, Josiah. 1847. The Slave Question. The Commercial Review of the South and the West 4 (3): 278–289.
The Fire at Wetherill’s White Lead Manufactory. 1893. Atkinson’s Saturday Evening Post, June 22. 18 (934): 2.
The Late Dr. Turnpenny, a Phrenologist. 1841. The Phrenological Journal and Miscellany 3: 48.
Wilson, Daniel. 1862. Prehistoric Man, Vol. 2. Cambridge, UK: Macmillian and Co.