Sun, Miaomiao, and Huey Yi@Colleen Wong. “Reliability and Validity of Questionnaire for Preschool Teachers in Music Teaching Ability: A Pilot Study”. International Journal of Academic Research in Progressive Education and Development, vol. 14, no. 4, Oct. 2025, pp. 360-73, https://ijarped.com/index.php/journal/article/view/3862.