W. E. B. Du Bois (2014). “The Problem of the Color Line at the Turn of the Twentieth Century: The Essential Early Essays”, p.220, Oxford University Press
W. E. B. Du Bois (2014). “The Problem of the Color Line at the Turn of the Twentieth Century: The Essential Early Essays”, p.59, Oxford University Press
W. E. B. Du Bois (2014). “Black Folk Then and Now (The Oxford W.E.B. Du Bois): An Essay in the History and Sociology of the Negro Race”, p.174, Oxford University Press
W. E. B. Du Bois (2013). “Black Reconstruction in America: Toward a History of the Part Which Black Folk Played in the Attempt to Reconstruct Democracy in America, 1860-1880”, p.13, Transaction Publishers