Opera in 1990

Bringing Soprano Arias to Life by Goldovsky, Boris, Schoep, Arthur

Richard Strauss: Elektra by

Opera Plot Index by Studwell, William E., Hamilton, David

Aspekte Der Offenbachiade: Untersuchungen Zu Den Libretti Der Großen Operetten Offenbachs by Groepper, Tamina

Kurt Weill: The Threepenny Opera by

Studien Zur Fruehen Verdi-Interpretation: Schalldokumente Bis 1926 by Hajtas, Franz

Operas in German: A Dictionary by Griffel, Margaret Ross