Thomas Jefferson, Nathaniel Francis Cabell, Joseph Carrington Cabell (1856). “Early History of the University of Virginia: As Contained in the Letters of Thomas Jefferson and Joseph C. Cabell, Hitherto Unpublished; with an Appendix, Consisting of Mr. Jefferson's Bill for a Complete System of Education and Other Illustrative Documents; and an Introduction, Comprising a Brief Historical Sketch of the University, and a Biographical Notice of Joseph C. Cabell”, p.385
B. L. Rayner, Thomas Jefferson (1834). “Life of Thomas Jefferson: with selections from the most valuable portions of his voluminious and unrivalled private correspondence : with portrait”, p.292
Benjamin Franklin (1817). “The Private Correspondence of Benjamin Franklin ...: Comprising a Series of Letters on Miscellaneous, Literary, and Political Subjects, Written Between the Years 1753 and 1790, Illustrating the Memoirs of His Public and Private Life, and Developing the Secret History of His Political Transactions and Negociations”, p.52