Kembaren, Ronaldo Abadi S., and Irwansyah Siregar. “The Effect of Backhand Groundstroke Training Variations on Backhand Ability in the Unimed Court Tennis Community in 2022”. Journal of Indonesian Active in Sports 1, no. 1 (February 24, 2024): 35–42. Accessed April 26, 2025. https://jurnal.unimed.ac.id/2012/index.php/jias/article/view/52373.