Harper, Robert G. The Case of the Georgia Sales on the Mississippi Considered. Philadelphia: Richard Folwell, 1799.
___. Observations on the Dispute Between the United States and France. 2d ed. Philadelphia: Thomas Bradford, 1797.
___. Select Works of Robert Goodloe Harper. Baltimore: O.H. Neilson Co., 1814.
Harper, Robert G., and Robert Walsh, Jr. Correspondence Respecting Russia between Robert Goodloe Harper, Esq., and Robert Walsh, Jun. Philadelphia: W. Fry, 1813.
Marks, Bayly Ellen, ed. Robert Goodloe Harper Family Papers. Wilmington, DE: Scholarly Resources, 1972. Microfilm. 5 reels and guide.
Papenfuse, Eric Robert. The Evils of Necessity: Robert Goodloe Harper and the Moral Dilemma of Slavery. Philadelphia: American Philosophical Society, 1997.
Sommerville, Charles W. Robert Goodloe Harper. Washington: Neale Co., 1899.