Bangun, Sabaruddin Yunis, and Fachrul Rozy Arnas. “Development of Ball Dropper Media on Hitting Practices in Softball Games”. Jp.Jok (Jurnal Pendidikan Jasmani Olahraga Dan Kesehatan), vol. 7, no. 1, Jan. 2025, pp. 180-91, doi:10.33503/jp.jok.v7i1.997.