1. Aristotle: 1981, The Politics, trans. Thomas Alan Sinclair (Penguin Classics, New York), p. 90.
2. Benedict XVI: 2008, ‘Angelus’, http://www.vatican.va/holy_father/benedict_xvi/angelus/2008/documents/hf_ben-xvi_ang_20080706_en.html .
3. Borna, Shaheen and James Lowry, 1987, Gambling and Speculation, Journal of Business Ethics 6 (3), 219-225.
4. Chancellor Edward (1999) Devil Take the Hindmost: A History of Financial Speculation. Farrar, Strauss, and Giroux, New York.
5. Clotfelter Charles T., 1989, Selling Hope: State Lotteries in America. Harvard University Press.