Duiker, W. J., & Spielvogel, J. J. (1994). World history. West publishing co..
Lua i Stíl Chicago (17ú heag.)Duiker, William J., agus Jackson J. Spielvogel. World History. Minneapolis: West publishing co., 1994.
Lua MLA (9ú heag.)Duiker, William J., agus Jackson J. Spielvogel. World History. West publishing co., 1994.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.