Cita APA (7th ed.)

Duiker, W. J., & Spielvogel, J. J. (2014). The essential world history  (Seventh edition.). Wadsworth, Cengage Learning.

Cita Chicago (17th ed.)

Duiker, William J., i Jackson J. Spielvogel. The essential world history . Seventh edition. Australia: Wadsworth, Cengage Learning, 2014.

Cita MLA (9th ed.)

Duiker, William J., i Jackson J. Spielvogel. The essential world history . Seventh edition. Wadsworth, Cengage Learning, 2014.