Lavigne, A., Gottwald, L., Anders, A., & Davis, T. (2009). Keep holding on: For SATB, solos and piano with optional instrumental accompaniment. Hal Leonard.
Chicago (17e ed.) BronvermeldingLavigne, Avril, Lukasz Gottwald, Adam Anders, en Tim Davis. Keep Holding on: For SATB, Solos and Piano with Optional Instrumental Accompaniment. Milwaukee, Wis: Hal Leonard, 2009.
MLA (9e ed.) BronvermeldingLavigne, Avril, et al. Keep Holding on: For SATB, Solos and Piano with Optional Instrumental Accompaniment. Hal Leonard, 2009.
Let op: Deze citaties zijn niet altijd 100% accuraat.