Citação norma APA
Christy, V. A., & Paton, J. G. (1990). Foundations of singing: A text book in vocal technique and song interpretation (5th .ed.). Wm. C. Brown.
Citação norma Chicago
Christy, Van A., and John Glenn Paton. Foundations of Singing: A Text Book in Vocal Technique and Song Interpretation. 5th .ed. U.S.A: Wm. C. Brown, 1990.
Citação norma MLA
Christy, Van A., and John Glenn Paton. Foundations of Singing: A Text Book in Vocal Technique and Song Interpretation. 5th .ed. Wm. C. Brown, 1990.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.