Duiker, W. J. (2010). Contemporary world history (5th ed.). Wadsworth.
Chicago Style (17th ed.) ZitazioaDuiker, William J. Contemporary World History. 5th ed. Boston, MA: Wadsworth, 2010.
MLA (9th ed.) ZitazioaDuiker, William J. Contemporary World History. 5th ed. Wadsworth, 2010.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.