Jamsai, J., & Techawattanasiridumrong, W. (2020). THE DEVELOPMENT OF A TRAINING PROGRAM FOR PHYSICAL FITNESS STRENGTHENING OF STUDENTS IN MATTAYOMSUKSA TWO, NAKHONLUANG UDOMRATWITTHAYA SCHOOL, THE SECONDARY EDUCATIONAL SERVICE AREA OFFICE 3. Journal of MCU Nakhondhat, 7(12), 94–106. retrieved from https://so03.tci-thaijo.org/index.php/JMND/article/view/249099