Achmad, Fairuz Yosmaral, Tommy Soenyoto, and Fajar Awang Irawan. “The Development of Swingtie Ball Media for Baseball Game Learning Aids for Elementary School Students”. Journal of Physical Education and Sports 8, no. 3 (July 5, 2019): 272-280. Accessed May 19, 2024. https://journal.unnes.ac.id/sju/jpes/article/view/31271.