“To George Washington from William Livingston, 3 Sept. 1779 [letter not found],” Founders Online, National Archives, https://founders.archives.gov/documents/Washington/03-22-02-1069. [Original source: The Papers of George Washington, Revolutionary War Series, vol. 22, 1 August–21 October 1779, ed. Benjamin L. Huggins. Charlottesville: University of Virginia Press, 2013, p. 345.]