Waruthinkerd, Triruk. “THE SELF - DISCIPLINE DEVELOPMENT OF THE CHAIYAPHUM INSTITUTE OF PHYSICAL EDUCATION STUDENTS BY TRAINING PROGRAM APPLYING TRISIKHA:”. Academic Journal of Thailand National Sports University 4, no. 2 (May 1, 2012): 1–10. accessed September 18, 2026. https://he02.tci-thaijo.org/index.php/TNSUJournal/article/view/254468.