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”
W. E. B. Du Bois, Frederick Douglass, Booker T. Washington (2012). “Three African-American Classics: Up from Slavery, The Souls of Black Folk and Narrative of the Life of Frederick Douglass”, p.137, Courier Corporation