Guy. The Magic of Beverly Sills. University of Illinois Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGuy. The Magic of Beverly Sills. University of Illinois Press.
एमएलए (9वां संस्करण) प्रशस्ति पत्रGuy. The Magic of Beverly Sills. University of Illinois Press.
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