Friedrich Nietzsche (2017). “THUS SPOKE ZARATHUSTRA (Modern Classics Series): The Magnum Opus of the World’s Most Influential Philosopher, Revolutionary Thinker and the Author of The Antichrist, The Birth of Tragedy & Beyond Good and Evil”, p.50, e-artnow
Friedrich Nietzsche (2017). “Thus Spoke Zarathustra, Beyond Good and Evil, Hellenism & Pessimism – 3 Unbeatable Philosophy Books in One Volume: The Birth of Tragedy”, p.181, e-artnow