- Friedrich Nietzsche. Thus Spoke Zarathustra. Cambridge, UK: Cambridge University Press, 2006.
- Laurence Lampert. Nietzsche's Teaching: An Interpretation of Thus Spoke Zarathustra. New Haven: Yale University Press, 1986.
- "The Stanford Encyclopedia of Philosophy." 2004-08-26. 2007-10-12. <http://plato.stanford.edu/entries/nietzsche/#1>.
Thus Spoke Zarathustra