1John Adams to Thomas Jefferson, 18 May 1817 (Jefferson Papers)
Buchanan, Joseph; The Philosophy of Human Nature [index entry]
2John Adams to Thomas Jefferson, 26 May 1817 (Jefferson Papers)
Buchanan, Joseph; The Philosophy of Human Nature [index entry]
3Thomas Jefferson to John Adams, 8 September 1817 (Jefferson Papers)
Buchanan, Joseph; The Philosophy of Human Nature [index entry]