1. Learned helplessness in humans: Critique and reformulation.
2. Person and contextual features of daily stress reactivity: Individual differences in relations of undesirable daily events with mood disturbance and chronic pain intensity.
3. American Association of Cardiovascular and Pulmonary Rehabilitation. (1998). Guidelines for cardiac rehabilitation and secondary prevention programs (3rd ed.). Danvers, MA: Human Kinetics.
4. American Heart Association. (2002a). Biostastical fact sheet: International cardiovascular disease statistics.Retrieved December 31, 2002, from http: www.americanheart.org
5. American Heart Association. (2002b). Heart fact sheet 2002: All Americans. Retrieved December 31, 2002, from http: www.americanheart.org