1Thomas Jefferson to John Adams, 24 January 1814 (Jefferson Papers)
Barton, William; Memoirs of the Life of David Rittenhouse [index entry]
2Thomas Jefferson to William Barton, 2 October 1812 (Jefferson Papers)
Barton, William; Memoirs of the Life of David Rittenhouse [index entry]
3Thomas Jefferson to Nicolas G. Dufief, 16 August 1814 (Jefferson Papers)
Barton, William; Memoirs of the Life of David Rittenhouse [index entry]