1. W. E. B. Du Bois , The Souls of Black Folk: Essays and Reflections (A. C. McClurg & Co, 1903).
2. W. E. B. Du Bois , To the nations of the world (remarks by Chairman Alan Greenspan at the Annual Dinner and Francis Boyer Lecture of The American Enterprise Institute for Public Policy Research, Washington, DC). https://www.federalreserve.gov/boarddocs/speeches/1996/19961205.htm. Accessed 20 June 2013.
3. S. Camp , Closer to Freedom (University of North Carolina Press, 2005).
4. W. E. B. Du Bois , Black Reconstruction in America (Routledge, 2017).
5. A. Acharya , M. Blackwell , M. Sen , Deep Roots (Princeton University Press, 2020), vol. 6.