^Mason, Matthew. 2014. "A Missed Opportunity? The Founding, Postcolonial Realities, and the Abolition of Slavery" Slavery & Abolition 35, no. 2: 199–213
^Minutes of the Supreme Executive Council of Pennsylvania, from its organization to the termination of the Revolution. [March 4, 1777 – December 20, 1790]. Harrisburg, Pub. by the State, 1852–53. Entries for December 1, 1778 (v. XI, pp 632–634), March 5, 1777 (v. XI, pp 173–174), October 11, 1779 (v. XII, p 127).