"Early history of the University of Virginia : as contained in the letters of Thomas Jefferson and Joseph C. Cabell, hitherto unpublished". Book by Thomas Jefferson, 1856.
Thomas Jefferson (1829). “Memoirs Corespondence and Private Papers of Thomas Jefferson Late, President of the United States: Now First Published the Original Manuscripts”, p.347
Thomas Jefferson (1854). “The Writings of Thomas Jefferson: Being His Autobiography, Correspondence, Reports, Messages, Addresses, and Other Writings, Official and Private : Published by the Order of the Joint Committee of Congress on the Library, from the Original Manuscripts, Deposited in the Department of State”, p.390