Ruiling, H., & Sabri, S. B. (2025). Development and Validation of A Survey for Measuring Instructors’ Pedagogical Content Knowledge Level of One-To-One Pop Singing Courses at the Conservatories in China. International Journal of Academic Research in Progressive Education and Development, 14(1), 43–53. Retrieved from https://ijarped.com/index.php/journal/article/view/3319