P. M. Mateos, J. J. G. Meilán, and J. M. Arana, “Motivational versus volitional mediation of passivity in institutionalized older people”., Span. j. psychol., vol. 5, no. 1, p. 54, Jan. 2002, Accessed: Dec. 05, 2025. Available: https://revistas.ucm.es/index.php/SJOP/article/view/SJOP0202120054A