VAELLO ORTS, J. Nivel de malestar. Padres y Maestros / Journal of Parents and Teachers, [S. l.], n. 331, p. 17–20, 2013. Disponível em: https://revistas.comillas.edu/index.php/padresymaestros/article/view/1232. Acesso em: 20 abr. 2024.