Jamrern, R. ., P. . Intacharoen, N. . Khamsri, and P. . Chainok. “PERFORMANCE AND COMPETITION ANALYSIS OF YOUTH TAEKWONDO ATHLETES”. Academic Journal of Thailand National Sports University, vol. 12, no. 3, Sept. 2020, pp. 13-22, https://he02.tci-thaijo.org/index.php/TNSUJournal/article/view/244986.