Adams, Henry.  History of the United
States of America During the  Administration of Thomas Jefferson. 
New York: Library of America, 1986.   This classic work remains
the authority on Jeffersons presidency.
Bailyn, Bernard.  The Ideological Origins
of the American Revolution.   Enl. ed.  Cambridge: Harvard
University Press, 1992.   A hallmark text concerning the philosophical
persuasions of the nations  founding fathers.
Bishop, Arthur, ed.  Thomas Jefferson
1743-1826.  Dobbs Ferry: Oceana  Publications, 1971. A
comprehensive timeline of the life and works of Thomas Jefferson.
Bowers, Claude G.  The Young Jefferson,
1743-1789.  Boston: Houghton  Mifflin Company, 1945. Though
somewhat dated, this is the most concentrated treatment of Jeffersons
 youth and political ascendancy.
Brodie, Fawn.  Thomas Jefferson: An Intimate
History.  New York: W.W.  Norton and Company, 1974. This
controversial work was the first scholarship to assert the validity
of the  long-rumored relationship between Jefferson and Sally Hemings.
Ellis, Joseph J.  American Sphinx: The
Character of Thomas Jefferson.   New York: Alfred A. Knopf,
1997. This much-celebrated examination of Jeffersons persona won
the National Book  Award.
Gordon-Reed, Annette.  Thomas Jefferson
and Sally Hemings: An American  Controversy.  Charlottesville:
University of Virginia Press, 1997. The best and most dispassionate
examination of the Jefferson-Hemings affair.
Lewis, Jan and Peter S. Onuf, Jane E. Lewis,
eds.  Sally Hemings and Thomas  Jefferson: History, Memory
and Civic Culture.  Charlottesville: University  of Virginia
Press, 1999. An anthology of recent essays on the Jefferson-Hemings
affair.
Peterson, Merrill D., ed.  Thomas Jefferson:
Writings.  New York: Library  of America, 1984.       The
major aspects of Jeffersons authorship and correspondence are presented
in  this handsome volume.
Randall, Willard Sterne.  Thomas Jefferson:
A Life.  New York: Henry Holt  and Company, 1993.     
 Thorough in aspects, thoroughly lacking in others, this one-volume
biography is  a valuable general reference.
Severance, John B.  Thomas Jefferson:
Architect of Democracy.  New York:  Clarion Books, 1998.
      This well-written study retains a degree of sophistication
despite being aimed  at the school-age reader.   
http://www.monticello.org 
The official website of the national heritage landmark.  Focuses
on Jeffersons  home and life, along with visitor information.  
http://www.monticello.org/plantation/hemings_resource.html 
An excellent resource regarding the recent developments in the Jefferson-Hemings
 affair.
http://www.th-jefferson.org 
A site featuring commentary by Clay Jenkinson, an acclaimed Jefferson
 impersonator and scholar.