Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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