Consolidated Illustrating Company, Allegheny County Pennsylvania: illustrated, in Historic Pittsburgh Text Collection, University of Pittsburgh. URL consultato il 16 settembre 2013.
Ohio Company Papers Finding Aid, in Ohio Company Papers, 1736–1813, DAR.1925.02, The Darlington Collection, Special Collections Department, University of Pittsburgh, University of Pittsburgh. URL consultato il 12 settembre 2013.
Charles Henry Ambler, George Washington and the West, in Historic Pittsburgh Text Collection, University of Pittsburgh. URL consultato il 20 settembre 2013.
George H. Thurston, Allegheny county's hundred years, in Historic Pittsburgh General Text Collection, University of Pittsburgh. URL consultato il 25 settembre 2013.