Vandemoortele, Peter. “Developing Elementary Harmonic Ear Training Exercises for Music Majors : An Approach Based on Root Motion Theory and Drill Technique”. Rangsit Music Journal 4, no. 2 (August 7, 2018): 59–69. Accessed May 9, 2024. https://so06.tci-thaijo.org/index.php/rmj/article/view/138897.