Shodikin, Shodikin, Harry Pramono, and Rumini Rumini. “The Development of Android-Based Score Sheet Application for the Referee (Chair Umpire) in Tennis Match”. Journal of Physical Education and Sports 8, no. 4 (July 8, 2019): 1-7. Accessed December 7, 2025. https://journal.unnes.ac.id/sju/jpes/article/view/31354.