Ayuningtyas, Natalia, Tri Rustiadi, and Harry Pramono. “Development of Ball Launcher Training Devices for Drill Smash, Block, Passing in Volleyball Sports”. Journal of Physical Education and Sports 11, no. 1 (March 30, 2022): 114-124. Accessed July 22, 2024. https://journal.unnes.ac.id/sju/jpes/article/view/56916.