Duiker, W. J., & Spielvogel, J. J. (2010). World history: To 1500 (6th ed.). Wadsworth/Cengage Learning.
Lua i Stíl Chicago (17ú heag.)Duiker, William J., agus Jackson J. Spielvogel. World History: To 1500. 6th ed. Australia: Wadsworth/Cengage Learning, 2010.
Lua MLA (8ú heag.)Duiker, William J., agus Jackson J. Spielvogel. World History: To 1500. 6th ed. Wadsworth/Cengage Learning, 2010.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.