Seligman, M.E.P. (1975) Helplessness: On depression, development and death. San Francisco: W.H. Freeman.
Stone, A. A.; Mezzacappa, E. S.; Donatone, B. A., and Gonder, M. (1999) Psychosocial stress and social support are associ- ated with prostate-specific...
Stowell, J.R.; Kiecolt-Glaser, J. y Glaser, R. (2001) Perceived stress and cellular immunity: When coping counts. Journal of Behavioral Medicine,...
Zigmond, A.S. y Snaith, R.P. (1983) The Hospital Anxiety and Depression Scale. Acta Psychiatrica Scandinavica, 67, 361-370.