Duncan, H. D. (1972). Symbols in society. Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Duncan, Hugh Dalziel. Symbols in Society. Londres, New York: Oxford University Press, 1972.
Lua MLA (9ú heag.)Duncan, Hugh Dalziel. Symbols in Society. Oxford University Press, 1972.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.