KUMAR, S.; SINGH, M.; SINGH BAL, B. A COMPREHENSIVE STUDY OF MENTAL TOUGHNESS OF OPEN AND CLOSED SKILL ATHLETES. International Journal of Behavioral Social and Movement Sciences, [S. l.], v. 3, n. 04, p. 71–77, 2014. Disponível em: https://ijobsms.org/index.php/ijobsms/article/view/245. Acesso em: 27 jul. 2025.