المؤلفون: Long, Newell H., Horvath, Arthur A., Bell, Josephine C., Landen, Lucie N.

المصدر: Music Educators Journal, 1977 May 01. 63(9), 7-12.

URL الوصول: https://www.jstor.org/stable/3395261

المؤلفون: Landen, Lucie N.

المصدر: American String Teacher; November 1979, Vol. 29 Issue: 4 p10-10, 1p