"The New Dictionary of Thoughts: A Cyclopedia of Quotations from the Best Authors of the World, both Ancient and Modern". Book compiled by Tryon Edwards et al., 1960.
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.48, Courier Corporation