1. Alberti, R. E., & Emmons, M. L. (1978).Your perfect right (3rd ed.). California: Impact.
2. Bandura, A. (1977). Self-efficacy: Toward a unifying theory of behaviour change.Psychological Review, 84 191?215.
3. Beck, A. (1967).Depression: Causes and treatment. Philadelphia: University of Pennsylvania Press.
4. Beck, A. (1974). The development of depression: A cognitive model. In R. Friedman & M. Katz (Eds.),The psychology of depression: Contemporary theory and research. Washington, D.C.: Winston.
5. Beck, A., Ward, C., Mendelson, M., Mock, J., & Erbaugh, J. (1961). An inventory for measuring depression.Archives of General Psychiatry, 4 53?63.