Seltsam, W. H., & Robinson, F. (1968). Metropolitan opera annals: Second supplement : 1957-1966 : a chronicle of artists and performances. H.W. Wilson.
Lua i Stíl Chicago (17ú heag.)Seltsam, William H., agus Francis Robinson. Metropolitan Opera Annals: Second Supplement : 1957-1966 : A Chronicle of Artists and Performances. New York: H.W. Wilson, 1968.
Lua MLA (9ú heag.)Seltsam, William H., agus Francis Robinson. Metropolitan Opera Annals: Second Supplement : 1957-1966 : A Chronicle of Artists and Performances. H.W. Wilson, 1968.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.