Du Bois. The Problem of the Color Line at the Turn of the Twentieth Century. Fordham University Press.
芝加哥风格引文Du Bois. The Problem of the Color Line at the Turn of the Twentieth Century. Fordham University Press.
MLA引文Du Bois. The Problem of the Color Line at the Turn of the Twentieth Century. Fordham University Press.
警告：这些引文格式不一定是100％准确.