Tambunan, Doni Douglas, Sukiri, and Nofi Marlina Siregar. “Effectiveness of Game-Based Freestyle Swimming Training Models for Early Children (4-6 Years)”. Gladi : Jurnal Ilmu Keolahragaan 14, no. 01 (April 1, 2023): 121–128. Accessed November 23, 2024. https://journal.unj.ac.id/unj/index.php/gjik/article/view/33336.