Cita APA (7th ed.)

Duiker, W. J. (2015). Contemporary world history (Sixth edition.). Cengage Learning.

Cita Chicago (17th ed.)

Duiker, William J. Contemporary World History. Sixth edition. Stamford, Conn: Cengage Learning, 2015.

Cita MLA (9th ed.)

Duiker, William J. Contemporary World History. Sixth edition. Cengage Learning, 2015.