Effectiveness of Tennis Ball Dropping Machine in Improving Forehand and Backhand Training for Tennis Court Athletes in West Tanjung Jabun. COMPETITOR: Jurnal Pendidikan Kepelatihan Olahraga, [S. l.], v. 17, n. 2, p. 1935–1942, 2025. DOI: 10.26858/cjpko.v17i2.8. Disponível em: https://competitor.ojsunm.ac.id/index.php/competitor/article/view/8. Acesso em: 18 aug. 2025.