Zietz, K. L. (1999). Opera companies and houses of Western Europe, Canada, Australia and New Zealand: A comprehensive illustrated reference. McFarland.
Chicago-Zitierstil (17. Ausg.)Zietz, Karyl L. Opera Companies and Houses of Western Europe, Canada, Australia and New Zealand: A Comprehensive Illustrated Reference. Jefferson, NC [u.a.]: McFarland, 1999.
MLA-Zitierstil (9. Ausg.)Zietz, Karyl L. Opera Companies and Houses of Western Europe, Canada, Australia and New Zealand: A Comprehensive Illustrated Reference. McFarland, 1999.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.