Downs, R. (1983). Books that changed the world. New American.
Lua i Stíl Chicago (17ú heag.)Downs, Robert. Books That Changed the World. New York: New American, 1983.
Lua MLA (9ú heag.)Downs, Robert. Books That Changed the World. New American, 1983.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.