Columbia University. (1954). Chapters in Western civilization (2nd ed.). Columbia University Press.
Lua i Stíl Chicago (17ú heag.)Columbia University. Chapters in Western Civilization. 2nd ed. New York: Columbia University Press, 1954.
Lua MLA (8ú heag.)Columbia University. Chapters in Western Civilization. 2nd ed. Columbia University Press, 1954.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.