1. Conte, D. (2004). Oswald Spengler: Eine Einführung. Leipzig: Leipziger Universitätsverlag GmbH.
2. Farrenkopf, J. (2001). Prophet of decline: Spengler on world history and politics. Baton Rouge: Louisiana State University Press.
3. Frye, N. (1974). The decline of the West. Daedalus,103
4. (1) (Twentieth Century Classics Revisited, Winter 1974), 1-13.
5. Haack, S. (2007). Defending science: Within reason. New York: Prometheus Books.