Yusuf, Dede, Sudradjat Wiradihardja, and Iwan Hermawan. “The Effect of Flexibility, Kinesthetic Perception, and Motivation on the Skills of the 50 Meter Butterfly Swimming”. Gladi : Jurnal Ilmu Keolahragaan 13, no. 04 (December 30, 2022): 360–372. Accessed November 23, 2024. https://journal.unj.ac.id/unj/index.php/gjik/article/view/28513.