Haryanto, Jeki, Murniati Murniati, and Dessi Sari. “Tingkat Akurasi Servis Forehand Backspin”. Sport Science 21, no. 1 (March 4, 2021): 59-67. Accessed February 23, 2025. http://sportscience.ppj.unp.ac.id/index.php/jss/article/view/64.