“An Empirical Study of the Volleyball Playing Skill Profile of Student Athletes in the Volleyball Student Activity Unit at Universitas Muhammadiyah Surakarta”. COMPETITOR: Jurnal Pendidikan Kepelatihan Olahraga, vol. 18, no. 1, Feb. 2026, pp. 0281-94, https://competitor.idjournal.eu/index.php/competitor/article/view/515.