Cita APA (7th ed.)
Kolchin, P. (1987). Unfree labor: American slavery and Russian serfdom. Belknap Press of Harvard University Press.
Cita Chicago (17th ed.)
Kolchin, Peter. Unfree Labor: American Slavery and Russian Serfdom. Cambridge, MA: Belknap Press of Harvard University Press, 1987.
Cita MLA (9th ed.)
Kolchin, Peter. Unfree Labor: American Slavery and Russian Serfdom. Belknap Press of Harvard University Press, 1987.
Atenció: Aquestes cites poden no estar 100% correctes.