Ferguson, G. W. (1959). Signs and symbols in Christian art ([Popular ed. ; complete and unabridged].). Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Ferguson, George Wells. Signs and Symbols in Christian Art. [Popular ed. ; complete and unabridged]. New York: Oxford University Press, 1959.
Lua MLA (9ú heag.)Ferguson, George Wells. Signs and Symbols in Christian Art. [Popular ed. ; complete and unabridged]. Oxford University Press, 1959.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.