Duiker, W. J., & Spielvogel, J. J. (2016). World history (Eighth edition.). Cengage Learning.
Lua i Stíl Chicago (17ú heag.)Duiker, William J., agus Jackson J. Spielvogel. World History. Eighth edition. Australia: Cengage Learning, 2016.
Lua MLA (9ú heag.)Duiker, William J., agus Jackson J. Spielvogel. World History. Eighth edition. Cengage Learning, 2016.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.