KS, Sugiyanto. PENGEMBANGAN ALAT UKUR KETERAMPILAN DASAR BERMAIN SOFTBALL. Jurnal Cakrawala Pendidikan, [S. l.], v. 3, n. 3, 2010. DOI: 10.21831/cp.v3i3.358. Disponível em: https://journal.uny.ac.id/index.php/cp/article/view/358. Acesso em: 5 may. 2025.