“Self-Confidence of The Rugby Athletes of The Responsible Contingent Following The PON XXI Championship Aceh-Sumut 2024”. COMPETITOR: Jurnal Pendidikan Kepelatihan Olahraga 17, no. 1 (February 28, 2025): 410–417. Accessed July 18, 2025. https://competitor.idjournal.eu/index.php/competitor/article/view/209.