Cita APA (7th ed.)

Duiker, W. J., & Spielvogel, J. J. (2017). The essential world history (Eighth edition.). Cengage Learning.

Cita Chicago (17th ed.)

Duiker, William J., i Jackson J. Spielvogel. The Essential World History. Eighth edition. Australia: Cengage Learning, 2017.

Cita MLA (9th ed.)

Duiker, William J., i Jackson J. Spielvogel. The Essential World History. Eighth edition. Cengage Learning, 2017.