Kets-ard, W., and A. Anmanatarkul. “DEVELOPING SELF-DIRECTED LEARNING SKILLS THROUGH THE FLIPPED CLASSROOM ACTIVITIES, CASE STUDY OF PNEUMATICS AND HYDRAULICS COURSE”. Journal of Industrial Education, vol. 22, no. 3, Dec. 2023, pp. 39-51, https://ph01.tci-thaijo.org/index.php/JIE/article/view/251801.