Sources:
 

Jefferson Papers:

The Papers of Thomas Jefferson, Volume 8,  25 February to 31 October 785.  Julian P. Boyd, editor. Princeton: Princeton University Press, 1953

Madison Papers:
 

The Papers of James Madison, Volume 8, 10 March 1784-28 March 1786. Robert A Rutland and William M. E. Rachal, eds. Chicago: University of Chicago Press, 1973.

Smith, Republic of Letters:

The Republic of Letters.  The Correspondence between Thomas Jefferson and James Madison 1776-1826. 3 vols. New York: W.W. Norton & Co., 1995.