Crippen, R. C. (1983). GC. Pergamon Press.
Lua i Stíl Chicago (17ú heag.)Crippen, Raymond C. GC. New York: Pergamon Press, 1983.
Lua MLA (9ú heag.)Crippen, Raymond C. GC. Pergamon Press, 1983.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.