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Thomas Jefferson, J. Jefferson Looney (2004). “The Papers of Thomas Jefferson, Retirement Series, Volume 2: 16 November 1809 to 11 August 1810”, p.110, Princeton University Press
Thomas Jefferson, H. A. Washington (2011). “The Writings of Thomas Jefferson: Being His Autobiography, Correspondence, Reports, Messages, Addresses, and Other Writings, Official and Private”, p.432, Cambridge University Press