Valencia A, C., López, M. X., Muñoz, G. E., Saavedra, C. P., & Vélez, P. (1993). Effects of a recreational therapy program on the depressive state of elderly institutionalized in El Cottolengo, 1988-1989. Colombia Medica, 24(2), 47–52. https://doi.org/10.25100/cm.v24i2.6472