Pambudi, Aris Fajar, Hendra Setyawan, Willy Ihsan Rizkyanto, Ismail Gani, and Muhammad Sigit Antoni. “Exploration of Student-Athletes’ Mental Toughness Due to Frequency of Synchronous Online Learning”. European Journal of Sport Sciences 2, no. 1 (February 16, 2023): 15–22. Accessed May 16, 2025. https://www.ej-sport.org/index.php/sport/article/view/60.