APA (7th ed.) Citation

Nietzsche, F. (1995). Zarathustra's discourses. Penguin books.

Chicago Style (17th ed.) Citation

Nietzsche, Friedrich. Zarathustra's Discourses. New York [etc.]: Penguin books, 1995.

MLA (9th ed.) Citation

Nietzsche, Friedrich. Zarathustra's Discourses. Penguin books, 1995.