David Walker (1965). “David Walker's Appeal: In Four Articles, Together with a Preamble, to the Coloured Citizens of the World, But in Particular, and Very Expressly, to Those of the United States of America”
George Whitefield (1771). “The Works of the Reverend George Whitefield, M.A...: Containing All His Sermons and Tracts which Have Been Already Published: with a Select Collection of Letters... Also, Some Other Pieces on Important Subjects, Never Before Printed; Prepared by Himself for the Press; to which is Prefixed, an Account of His Life, Compiled from His Orignial Papers and Letters”, p.82