Cita APA (7th ed.)

Duiker, W. J., & Spielvogel, J. J. (2010). World history (6th ed.). Wadsworth Cengage Learning.

Cita Chicago (17th ed.)

Duiker, William J., i Jackson J. Spielvogel. World History. 6th ed. Boston, MA: Wadsworth Cengage Learning, 2010.

Cita MLA (9th ed.)

Duiker, William J., i Jackson J. Spielvogel. World History. 6th ed. Wadsworth Cengage Learning, 2010.