Gandasari, M. F., G. F. Yosika, E. Yantiningsih, and M. Firman Annur. “Development of Tennis Achievements by Using Half the Competition”. GANDRUNG: Jurnal Pengabdian Kepada Masyarakat, Vol. 4, no. 2, July 2023, pp. 1195-9, https://ejournal.unibabwi.ac.id/index.php/gandrung/article/view/2851.