Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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