Operas in German : a dictionary / Margaret Ross Griffel ; Adrienne Fried Block, advisory editor.

Eitemau Tebyg

• Operas in English : a Dictionary.
  gan: Griffel, Margaret Ross
  Cyhoeddwyd: (2012)
• The New Grove dictionary of opera
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• Encyclopedia of the opera.
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• Blacks in opera : an encyclopedia of people and companies, 1873-1993
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• Annals of opera, 1597-1940
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