1. de Gobineau, A. (1853–1855/1967). The inequality of human races (A. Collins, Trans.). Howard Fertig, Inc.
2. Farrall, L. A. (1979/2011). The history of eugenics: A bibliographical review. Annals of Science, 36(2), 111–123.
3. Fisher, J. (2006). Reluctantly inspired: George MacDonald and JRR Tolkien. North Wind: A Journal of George MacDonald Studies, 25(8), 113–120.
4. Foucault, M. (1976/2020). The history of sexuality, volume 1: The will to knowledge (R. Hurley, Trans.). Penguin Classics.
5. Galton, F. (1883/1973). Inquiries into human faculty and its development. AMS Press.