Drescher, S., & Engerman, S. L. (1998). Historical guide to World Slavery. Oxford University.
Chicago Style aipamenaDrescher, Seymour, and Slanley L. Engerman. Historical Guide to World Slavery. New York: Oxford University, 1998.
MLA aipamenaDrescher, Seymour, and Slanley L. Engerman. Historical Guide to World Slavery. Oxford University, 1998.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.