Columbia subject headings:
Friedrich, Götz.
Opera--Production and direction.
Wagner, Richard, 1813-1883--Criticism and interpretation.
Harvard subject headings:
Friedrich, Götz
Opera--Production and direction
Wagner, Richard, 1813-1883--Criticism and interpretation.
Princeton subject headings:
Opera--Production and direction.
Wagner, Richard, 1813-1883--Criticism and interpretation.