JATRA, R.; FERNANDO, D. D. The understanding of court tennis rules for participants of licensing tennis umpire training. Jurnal SPORTIF : Jurnal Penelitian Pembelajaran, [S. l.], v. 5, n. 1, p. 70–79, 2019. DOI: 10.29407/js_unpgri.v5i1.12754. Disponível em: https://ojs.unpkediri.ac.id/index.php/pjk/article/view/12754. Acesso em: 5 jan. 2025.