Indah Zunita, Kukuh Hardopo Putro, Nadine Nata Safitri, Edward Viktoryan Raymon Kalaibin, Muhammad Rizqi Eka Putra, Muhammad Izzudin Al Haq, Faros Shouma Askalani, et al. 2025. “The Relationship Between Self-Confidence and Concentration With the Ability to Smash Volleyball Athletes 12-17 Years Old in Pervas Club ”. Jorpres (Jurnal Olahraga Prestasi) 21 (2):57-66. https://doi.org/10.21831/jorpres.v21i2.95718.