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John Locke (1958). “The Reasonableness of Christianity: With A Discourse of Miracles, and Part of A Third Letter Concerning Toleration”, p.66, Stanford University Press
John Locke, James Augustus St. John (1872). “Philosophical Works: Preliminary discourse by the editor. On the conduct of the understanding. An essay concerning human understanding”, p.114
John Locke, Ruth Weissbourd Grant, Nathan Tarcov (1996). “Some Thoughts Concerning Education: And, Of the Conduct of the Understanding”, Hackett Publishing