Immanuel Kant, James Wesley Ellington (1994). “Ethical Philosophy: The Complete Texts of Grounding for the Metaphysics of Morals, and Metaphysical Principles of Virtue, Part II of The Metaphysics of Morals, with On a Supposed Right to Lie Because of Philanthropic Concerns”, p.30, Hackett Publishing
Charles Babbage's remarks in November 1839, recalling events in 1821; as quoted in Harry Wilmot Buxton and Anthony Hyman "Memoir of the Life and Labours of the Late Charles Babbage", 1988.