Friedrich Nietzsche (2016). “BEYOND GOOD AND EVIL - Prelude to a Philosophy of the Future: The Critique of the Traditional Morality and the Philosophy of the Past”, p.66, e-artnow
Friedrich Nietzsche, Bernard Williams, Josefine Nauckhoff (2001). “Nietzsche: The Gay Science: With a Prelude in German Rhymes and an Appendix of Songs”, p.203, Cambridge University Press
Friedrich Nietzsche (2017). “Thus Spoke Zarathustra, Beyond Good and Evil, Hellenism & Pessimism – 3 Unbeatable Philosophy Books in One Volume: The Birth of Tragedy”, p.320, e-artnow