COWDEN, Richard G. On the mental toughness of self-aware athletes: Evidence from competitive tennis players. South African Journal of Science, [S. l.], v. 113, n. 1/2, p. 6, 2017. DOI: 10.17159/sajs.2017/20160112. Disponível em: https://sajs.co.za/article/view/3579. Acesso em: 19 apr. 2024.