The Contribution of Concentration and Confidence to Penalty Kick Success in U-13 Football Players of SSB Balasuga Semarang. COMPETITOR: Jurnal Pendidikan Kepelatihan Olahraga, [S. l.], v. 18, n. 2, p. 2481–2493, 2026. DOI: 10.26858/cpjok.v18i2.740. Disponível em: https://competitor.idjournal.eu/index.php/competitor/article/view/740. Acesso em: 24 may. 2026.