“The Relationship Between Concentration, Achievement Motivation, and Academic Stress in Tennis Student Athletes”, Compet. J. Pendidik. Kepelatihan Olahraga, vol. 17, no. 1, pp. 160–168, Feb. 2025, Accessed: Mar. 19, 2026. [Online]. Available: https://competitor.idjournal.eu/index.php/competitor/article/view/182