Duiker, W. J., & Spielvogel, J. J. (2010). World history: To 1500 (6th ed.). Wadsworth/Cengage Learning.
Chicago Style (17. basım) AtıfDuiker, William J., ve Jackson J. Spielvogel. World History: To 1500. 6th ed. Australia: Wadsworth/Cengage Learning, 2010.
MLA (8th ed.) AtıfDuiker, William J., ve Jackson J. Spielvogel. World History: To 1500. 6th ed. Wadsworth/Cengage Learning, 2010.
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