John Stilwell Jenkins, Andrew Jackson (2011). “Life and Public Services of Gen. Andrew Jackson, Seventh President of the United States: Including the Most Important of His State Papers”, p.266, New Leaf Publishing Group
Benjamin Disraeli, Edmund Gosse, Robert Arnot (1904). “The Works of Benjamin Disraeli, Earl of Beaconsfield, Embracing Novels, Romances, Plays, Poems, Biography, Short Stories and Great Speeches: Coningsby, v. 2. Selected speeches”
Ian Hacking (2006). “The Emergence of Probability: A Philosophical Study of Early Ideas about Probability, Induction and Statistical Inference”, p.34, Cambridge University Press