Walters, R. (2000). Mezzo-Soprano, Belter: Comp. and ed. by Richard Walters. Hal Leonard.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWalters, Richard. Mezzo-Soprano, Belter: Comp. and Ed. by Richard Walters. Milwaukee, Wis.: Hal Leonard, 2000.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWalters, Richard. Mezzo-Soprano, Belter: Comp. and Ed. by Richard Walters. Hal Leonard, 2000.
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