1. Andler, Charles: Nietzsche, sa vie et sa pensée, Paris 1958
2. Bayertz, Kurt: “Darwinism and Scientific Freedom: Political Aspects of the Reception of Darwinism in Germany, 1863–1878,” Scientia 118 (1983), 297–307
3. Brobjer, Thomas H.: Nietzsche and the “English”: The Influence of British and American Thinking on his Philosophy, Amherst, MA 2008
4. Brobjer, Thomas H.: Nietzsche’s Philosophical Context: An Intellectual Biography, Urbana, IL 2008
5. Bury, John Bagnell: The Idea of Progress: An Inquiry into its Origin and Growth, Middlesex 1932