Friedrich Nietzsche, Maudemarie Clark, Brian Leiter (1997). “Nietzsche: Daybreak: Thoughts on the Prejudices of Morality”, p.18, Cambridge University Press
John Stuart Mill (2017). “JOHN STUART MILL - Ultimate Collection: Works on Philosophy, Politics & Economy (Including Memoirs & Essays): Autobiography, Utilitarianism, The Subjection of Women, On Liberty, Principles of Political Economy, A System of Logic, Ratiocinative and Inductive and More”, p.71, Madison & Adams