Muhammad Firdaus, Abdul Sukur, Hernawan, and Rizka Antoni. “The Development of Training Model of Backstroke Swimming Skills for Children Age 8-10 Years Old”. Gladi : Jurnal Ilmu Keolahragaan 13, no. 1 (March 31, 2022): 1 - 14. Accessed May 5, 2025. http://103.8.12.212:33180/unj/index.php/gjik/article/view/26615.