1. Abrahms, J. (1981). Depression versus normal grief following the death of a significant other. In G. Emery, S. Hollon, & R. Bedrosian (Eds.), New directions in cognitive therapy (pp. 255–270). New York: Guilford.
2. Abramson, L., Seligman, M., & Teasdale, J. (1978). Learned helplessness in humans: Critique and reformulation. Journal of Abnormal Psychology, 87, 102–109.
3. Averill, J. (1968). Grief: Its nature and significance. Psychological Bulletin, 70, 721–748.
4. Beck, A., Ward, C., Mendelson, M., Mock, J., & Erbaugh, J. (1961). An inventory for measuring depression. Archives of General Psychiatry, 4, 561–571.
5. Beck, A. T., Rush, A. J., Shaw, B., & Emery, G. (1979). Cognitive therapy of depression. New York: Guilford.