* Knupfer, Peter B. "Compromise and Statesmanship: Henry Clay’s Union." in Knupfer, ''The Union As It Is: Constitutional Unionism and Sectional Compromise, 1787-1861'' (1991), pp. 119–57. | * Knupfer, Peter B. "Compromise and Statesmanship: Henry Clay’s Union." in Knupfer, ''The Union As It Is: Constitutional Unionism and Sectional Compromise, 1787-1861'' (1991), pp. 119–57. |