Czerny, P. (1964). Opernbuch. Henschelverlag.
Cita Chicago (17th ed.)Czerny, Peter. Opernbuch. Berlin: Henschelverlag, 1964.
Cita MLA (8th ed.)Czerny, Peter. Opernbuch. Henschelverlag, 1964.
Atenció: Aquestes cites poden no estar 100% correctes.
Cita APA (7th ed.)