Ingram, M. D. (1962). Vocal technique for children and youth. Abingdon.
芝加哥风格引文Ingram, Madeline D. Vocal Technique for Children and Youth. New York: Abingdon, 1962.
MLA引文Ingram, Madeline D. Vocal Technique for Children and Youth. Abingdon, 1962.
警告：这些引文格式不一定是100％准确.