Duiker, W. J., & Spielvogel, J. J. (2019). World history (Ninth edition.). Wadsworth Cengage Learning.
Chicago Style (17. basım) AtıfDuiker, William J., ve Jackson J. Spielvogel. World History. Ninth edition. Australia: Wadsworth Cengage Learning, 2019.
MLA (9th ed.) AtıfDuiker, William J., ve Jackson J. Spielvogel. World History. Ninth edition. Wadsworth Cengage Learning, 2019.
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