Akbari, M., Dlis, F., & Widiastuti, W. (2018). THE EFFECT AT MUSCLE POWER ARM, HAND-EYE COORDINATION, FLEXIBILITY AND SELF CONFIDENCE UPON BADMINTON SMASH SKILL. JIPES - JOURNAL OF INDONESIAN PHYSICAL EDUCATION AND SPORT, 4(1), 57–64. https://doi.org/10.21009/JIPES.041.05