Yang, E.-C., and O. R. González González. “A Comparative Study of Grades 9-12 Students’ Perceptions of Teaching Effectiveness in Music Class According to Gender, Years of Enrollment, and Music Instrument Played at The American School of Bangkok, Green Valley Campus”. Scholar: Human Sciences, vol. 10, no. 2, Dec. 2018, p. 305, http://www.assumptionjournal.au.edu/index.php/Scholar/article/view/2891.