Duiker, W. J., & Spielvogel, J. J. (2004). World history (4th ed.). Thomson/Wadsworth.
Lua i Stíl Chicago (17ú heag.)Duiker, William J., agus Jackson J. Spielvogel. World History. 4th ed. Belmont, CA: Thomson/Wadsworth, 2004.
Lua MLA (9ú heag.)Duiker, William J., agus Jackson J. Spielvogel. World History. 4th ed. Thomson/Wadsworth, 2004.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.