Friedrich Wilhelm Nietzsche, Thomas Wayne (2004). “Ecce Homo: How One Becomes what One is; The Antichrist: a Curse on Christianity”, p.135, Algora Publishing
James Boswell, Samuel Johnson (1824). “The Life of Samuel Johnson, LL. D., Comprehending an Account of His Studies, and Numerous Works, in Chronological Order: A Series of His Epistolary Correspondence and Conversations with Many Eminent Persons; and Various Original Pieces of His Composition, Never Before Published; the Whole Exhibiting a View of Literature and Literary Men in Great Britain, for Near Half a Century During which He Flourished”, p.66