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.47, Courier Corporation
John Filson, Daniel Boone (1793). “The discovery, settlement and present state of Kentucky, and an introduction to the topography and natural history of that ... country. Also colonel Daniel Boon's narrative of the wars of Kentucky”, p.36