Cita APA (7th ed.)

Duiker, W. J., & Spielvogel, J. J. (1994). World history. West publishing co..

Cita Chicago (17th ed.)

Duiker, William J., i Jackson J. Spielvogel. World History. Minneapolis: West publishing co., 1994.

Cita MLA (9th ed.)

Duiker, William J., i Jackson J. Spielvogel. World History. West publishing co., 1994.