Sudrajat, A., N. Nasuka, and F. A. Irawan. “Development of ANS PONG As a Tool for Block Training and Smash in Table Tennis Games”. Journal of Physical Education and Sports, Vol. 8, no. 1, Sept. 2018, pp. 19-25, https://journal.unnes.ac.id/sju/jpes/article/view/26164.