Ingram, M. D. (1962). Vocal technique for children and youth. Abingdon.
Chicago-čujuhus (17. p.)Ingram, Madeline D. Vocal Technique for Children and Youth. New York: Abingdon, 1962.
MLA-čujuhus (9. p.)Ingram, Madeline D. Vocal Technique for Children and Youth. Abingdon, 1962.
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