- The Papers of Thomas Jefferson, ed. Julian P. Boyd, vol. 1, 1760–1776 (Princeton University Press, 1950), 246–47.
- Abraham Lincoln, “Speech at Springfield, Illinois,” June 26, 1857, in The Collected Works of Abraham Lincoln, ed. Roy P. Basler, vol. 2, 1848–1858 (Rutgers University Press, 1953), 406.
