Akbari, Myrza, Firmansyah Dlis, and Widiastuti Widiastuti. 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.