Warren, R. (1995). Opera workshop: Studies in understanding and interpretation. Scolar Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWarren, Raymond. Opera Workshop: Studies in Understanding and Interpretation. Aldershot, Hants, Eng: Scolar Press, 1995.
एमएलए (9वां संस्करण) प्रशस्ति पत्रWarren, Raymond. Opera Workshop: Studies in Understanding and Interpretation. Scolar Press, 1995.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.