SOMPHONG, Suriyan, Wimonmas PRACHAKUL, and Supitr SAMAHITO. “THE CONSTRUCTION OF A MENTAL TOUGHNESS MEASURE FOR TAEKWONDO ATHLETES”. Journal of Sports Science and Technology 11, no. 2 (January 12, 2012): 260–273. accessed March 6, 2026. https://he01.tci-thaijo.org/index.php/JSST/article/view/44020.