1. Baum, A., Singer, J.E., & Baum, C.S. (1981). Stress and the environment.Journal of Social Issues, 37,(1), 4–35.
2. Benson, H. (1985). The relaxation response. In A. Monat and R.S. Lazarus (Eds.),Stress and coping: An anthology (pp. 315–319). New York: Columbia University Press.
3. Cohen, L.H. (1988). Measurement of life events.Life events and psychological functioning: Theoretical and methodological issues (pp. 11–30). Beverly Hills: Sage Publications.
4. Cohen, S., & Williamson, G.M. (1988). Perceived stress in a probability sample of the United States. In S. Spacapan and S. Oskamp (Eds.),The social psychology of health. Beverly Hills: Sage Publications.
5. Derogatis, L.R. (1977).SCL-90R Manual - I. Baltimore: Clinical Psychometric Research.