Jatra, Rices, and Debi Dori Fernando. “The Understanding of Court Tennis Rules for Participants of Licensing Tennis Umpire Training”. Jurnal SPORTIF : Jurnal Penelitian Pembelajaran 5, no. 1 (May 21, 2019): 70-79. Accessed April 25, 2024. https://ojs.unpkediri.ac.id/index.php/pjk/article/view/12754.