Barnes, H. E. (1947). A survey of western civilization. T. Y. Crowell Co..
Lua i Stíl Chicago (17ú heag.)Barnes, Harry Elmer. A Survey of Western Civilization. New York: T. Y. Crowell Co., 1947.
Lua MLA (9ú heag.)Barnes, Harry Elmer. A Survey of Western Civilization. T. Y. Crowell Co., 1947.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.