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2. Malone, D. Jefferson the President: First Term, 1801-1805 Appendix II, 494-498 (Little Brown, Boston, MA, 1970).
3. Brodie, F. M. Thomas Jefferson: An Intimate History (Norton, New York, 1974).
4. Ellis, J. J. American Sphinx: The Character of Thomas Jefferson (Knopf, New York, 1997).
5. Callender, J. T. Richmond Recorder 1 September 1802. [Cited in: Gordon-Reed, A. Thomas Jefferson and Sally Hemings: An American Controversy (Univ. Press of Virginia, Charlottesville, 1997)].