DARMAWAN, Aditya Tito Aji. Mental toughness and self-confidence of volleyball extracurricular participants: un estudio de las diferencias de género. Retos, [S. l.], v. 62, p. 470–479, 2025. DOI: 10.47197/retos.v62.110600. Disponível em: http://207.180.252.49/index.php/retos/article/view/110600. Acesso em: 16 dec. 2025.