Walters, R. (2000). Mezzo-Soprano, Belter: Comp. and ed. by Richard Walters. Hal Leonard.
Chicago-referens (17:e uppl.)Walters, Richard. Mezzo-Soprano, Belter: Comp. and Ed. by Richard Walters. Milwaukee, Wis.: Hal Leonard, 2000.
MLA-referens (8:e uppl.)Walters, Richard. Mezzo-Soprano, Belter: Comp. and Ed. by Richard Walters. Hal Leonard, 2000.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.