Mary C. Neal, M.D. (2012). “To Heaven and Back: A Doctor's Extraordinary Account of Her Death, Heaven, Angels, and Life Again: A True Story”, p.103, WaterBrook
Henry Clay, William Branch Giles (1827). “Mr. Clay's Speech on the Tariff: Or, The "American System," So Called ; Or, The Anglican System, in Fact, Introduced Here ; and Perverted in Its Most Material Bearing Upon Society, by the Omission of a System of Corn Laws, for the Protection of Agriculture”, p.80