Mateos, Pedro M., Juan J. G. Meilán, and José M. Arana. “Motivational Versus Volitional Mediation of Passivity in Institutionalized Older People”. The Spanish Journal of Psychology 5, no. 1 (January 1, 2002): 54. Accessed December 5, 2025. https://revistas.ucm.es/index.php/SJOP/article/view/SJOP0202120054A.