B1789. Leslie Orrey, Ed. The Encyclopedia of Opera. New York, Scribner’s, 1976. 376pp. Photos; Illus., some in color; DJ. - 0-684-13630-9
"More than 3,000 entries, alphabetically arranged and fully cross-reference, cover more than 700 operas, the places where thy have been and are being performed, as well as composers, librettists, singers, conductors, designers, producers, and writers upon whose works operas are based, opera houses, major centers of opera and opera festivals, technical terms, opera on film, television and radio."