Götzen-Dämmerung, oder, Wie man mit dem Hammer philosophiert, 1889. Recommended translation: Nietzsche, Friedrich. Twilight of the Idols and The Anti-Christ. Translated by R. J. Hollingdale. London: Penguin Books, 1977.
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Beyond Good and Evil
Jenseits von Gut und Böse: Vorspiel einer Philosophie der Zukunft, 1886. Recommended translation: Nietzsche, Friedrich. Beyond Good and Evil: Prelude to a Philosophy of the Future. Translated by Walter Kaufmann. New York: Random House, 1966.
Thus Spoke Zarathustra
Also sprach Zarathustra: Ein Buch für Alle und Keinen, 1883. Recommended translation: Nietzsche, Friedrich. Thus Spoke Zarathustra: A Book for Everyone and No One. Translated by R. J. Hollingdale. London: Penguin Books, 1961.
The Gay Science
Die fröhliche Wissenschaft, 1882. Recommended translations: Nietzsche, Friedrich. The Gay Science, with a Prelude in Rhymes and an Appendix of Songs. Translated by Walter Kaufmann. New York: Random House, 1974. Nietzsche, Friedrich. The Gay Science (The Joyful Wisdom). Translated by Thomas Common. New York: Macmillan Co., 1924.
Untimely Meditations
Unzeitgemässe Betrachtungen, 1876. Nietzsche, Friedrich. Untimely Meditations. Edited by Daniel Breazeale. Translated by R. J. Hollingdale. Cambridge: Cambridge University Press, 1983, 1997.
Nietzsche’s Zarathustra by Stanley Rosen
Rosen, Stanley. The Mask of Enlightenment: Nietzsche’s Zarathustra. New Haven, CT: Yale University Press, 2004.
Nietzsche’s Task by Laurence Lampert
Lampert, Laurence. Nietzsche’s Task: An Interpretation of Nietzsche’s Beyond Good and Evil. New Haven, CT: Yale University Press, 2004.
Nietzsche’s Philosophy of the Eternal Recurrence by Karl Löwith
Löwith, Karl. Nietzsche’s Philosophy of the Eternal Recurrence of the Same. Berkeley: University of California Press, 1997.
Nietzsche: The Man and His Philosophy by R.J. Hollingdale
Hollingdale, R. J. Nietzsche: The Man and His Philosophy. Boston: Ark Paperbacks, 1985.
Nietzsche’s view of Socrates by Werner Dannhauser
Werner J. Dannhauser, Nietzsche's View of Socrates, Cornell University Press, 1974.