Du Bois. The Problem of the Color Line at the Turn of the Twentieth Century. Fordham University Press.
Chicago-referens (17:e uppl.)Du Bois. The Problem of the Color Line at the Turn of the Twentieth Century. Fordham University Press.
MLA-referens (9:e uppl.)Du Bois. The Problem of the Color Line at the Turn of the Twentieth Century. Fordham University Press.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.