Kolchin, P. (1987). Unfree labor: American slavery and Russian serfdom. Belknap Press of Harvard University Press.
芝加哥风格引文Kolchin, Peter. Unfree Labor: American Slavery and Russian Serfdom. Cambridge, Massachusetts: Belknap Press of Harvard University Press, 1987.
MLA引文Kolchin, Peter. Unfree Labor: American Slavery and Russian Serfdom. Belknap Press of Harvard University Press, 1987.
警告：这些引文格式不一定是100％准确.