Marom, Aufal, and Soegiyanto, KS. “PENGARUH UMPAN PITCHED BALL DAN SOFT TOSS BALL TERHADAP HASIL LATIHAN PUKULAN FLY BALL DAN GROUND BALL PADA TIM BASEBALL UNNES 2015”. Journal of Sport Science and Fitness 4, no. 3 (1). Accessed November 22, 2024. https://journal.unnes.ac.id/sju/jssf/article/view/7366.