“Improving Learning Outcomes of Underwear Passing In Volleyball Through The Use of Plastic Ball Media For Grade IV Students of SD Inpres Mare”. COMPETITOR: Jurnal Pendidikan Kepelatihan Olahraga 17, no. 3 (October 31, 2025): 2937–2951. Accessed December 8, 2025. https://competitor.idjournal.eu/index.php/competitor/article/view/418.