Sin, Tjung Hauw, and Budi Indra Ruslin. “Increasing Long Jump Performance through Plyometric Exercises”. COUNS-EDU: The International Journal of Counseling and Education 4, no. 2 (July 22, 2019): 88–93. Accessed May 3, 2024. https://counsedu.iicet.org/index.php/counsedu/article/view/209.