Williyanto, Septian, Nasuka Nasuka, and Donny Yudha Kusuma. “The Development of Badminton Skills Test Instruments for Athletes in Age of Children, Cub, Teenager and Youth”. Journal of Physical Education and Sports 7, no. 1 (May 22, 2018): 50-54. Accessed December 27, 2024. https://journal.unnes.ac.id/sju/jpes/article/view/23235.