Rukjumroon, P., and K. . Choeyhom. “EFFECTS OF LEG MUSCLE FLEXIBILITY TRAINING ON SPEED CLIMBING PERFORMANCE OF THAI YOUTH ELITE ATHLETES”. Academic Journal of Thailand National Sports University, vol. 17, no. 3, Aug. 2025, pp. 171-80, https://he02.tci-thaijo.org/index.php/TNSUJournal/article/view/266139.