Putranto, S. Y., A. Kristiyanto, and S. K. Purnama. “The Prediction Of Athletic Coping Skills Inventory, Leg Muscle Strength, Agility, Torso Flexibility, Eye-Foot Coordination, Leg Muscle Power With Idan Dollyo Chagi Tae Kwon Do Kyorugi Learning Result (Correlational Study on Player Tae Kwon Do 15-20 Year Age Group Class Under 54 Kilogram at Banyumas District)”. Journal of Education, Health and Sport, vol. 9, no. 4, Apr. 2019, pp. 84-95, https://apcz.umk.pl/JEHS/article/view/6764.