Cita APA (7th ed.)

Duiker, W. J., & Spielvogel, J. J. (1998). World history (2nd ed.). West/Wadsworth.

Cita Chicago (17th ed.)

Duiker, William J., i Jackson J. Spielvogel. World History. 2nd ed. Belmont, Calif: West/Wadsworth, 1998.

Cita MLA (9th ed.)

Duiker, William J., i Jackson J. Spielvogel. World History. 2nd ed. West/Wadsworth, 1998.