1. Aristotle. The Complete Works of Aristotle. Edited by Jonathan Barnes. Princeton, NJ: Princeton University Press, 1984.
2. Akademikerne i Dansk Politik i det ig. Århundrede: Nogle Synspunkter [Academics in Danish Politics in the Nineteenth Century: Some Views];Bagge Povl.;Historik Tidsskrift,1970
3. On the natural variety of mankind.
4. Über den Bildungstrieb /
5. Blumenbach, Johann. Elements of Physiology. Translated by Charles Caldwell. Philadelphia, PA: Thomas Dobson, 1795.