Pansasadee, A., Chatakan, W., & Ekpetch, C. (2026). A DEVELOPMENT OF THE MODEL OF INTERNAL SUPERVISION TO ENHANCE 21ST CENTURY LEARNER SKILLS FOR SCHOOLS UNDER THE NAKHON SI THAMMARAT PRIMARY EDUCATIONAL SERVICE AREA OFFICE 3. Journal of MCU Nakhondhat, 13(4), 237–247. retrieved from https://so03.tci-thaijo.org/index.php/JMND/article/view/298898