Citazione Stile APA (7a Edizione)

Duiker, W. J., & Spielvogel, J. J. (2019). World history (Ninth edition.). Wadsworth Cengage Learning.

Citazione stile Chigago Style (17a edizione)

Duiker, William J., e Jackson J. Spielvogel. World History. Ninth edition. Australia: Wadsworth Cengage Learning, 2019.

Citatione MLA (9a ed.)

Duiker, William J., e Jackson J. Spielvogel. World History. Ninth edition. Wadsworth Cengage Learning, 2019.