1. Combinatorial Chance.
2. Todhunter, Isaac. 1865.A History of the Mathematical Theory of Probability from the Time of Pascal to that of Laplace, 23–24. Cambridge and London: Macmillan and Co., Limited. Reprinted, New York: G. E. Stechert and Co., 1931; New York: Chelsea Publishing Company, 1949). Centennial of initial publication recognized in [1]