Naptheutrong, Unnop, Dissaphon Boobphachart, Sarawut Kusump, and Ekasak Hengsuko. 2026. “RELATIONSHIPS BETWEEN PHYSICAL FITNESS AND MENTAL TOUGHNESS IN ADOLESCENT COMBAT SPORT ATHLETES”. Journal of Sports Science and Health 27 (1). Bangkok, Thailand:87-101. https://he02.tci-thaijo.org/index.php/spsc_journal/article/view/280677.