Duiker, W. J. (2015). Contemporary world history (Sixth edition.). Cengage Learning.
Citazione stile Chigago Style (17a edizione)Duiker, William J. Contemporary World History. Sixth edition. Stamford, Conn: Cengage Learning, 2015.
Citatione MLA (9a ed.)Duiker, William J. Contemporary World History. Sixth edition. Cengage Learning, 2015.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.