Bourne, J., & Kennedy, M. (1998). Who's who in opera: A guide to opera characters. Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Bourne, Joyce, agus Michael Kennedy. Who's Who in Opera: A Guide to Opera Characters. Oxford: Oxford University Press, 1998.
Lua MLA (9ú heag.)Bourne, Joyce, agus Michael Kennedy. Who's Who in Opera: A Guide to Opera Characters. Oxford University Press, 1998.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.