1. Abraham, K. Selected papers of Karl Abraham, M.D. London: Hogarth Press, 1949.
2. Albert, N., and Beck, A. T. Incidence of depression in early adolescence: A preliminary study. Journal of Youth and Adolescence, 1975, 4, 301–307.
3. American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorders ( 3rd ed. ). Washington, D.C.: APA, 1980.
4. Anthony, E. J., and Benedek, T. Depression and human existence. Boston: Little, Brown and Company, 1975.
5. Anthony, E. J., and Gilpin, D. C. (Eds.). Three clinical faces of childhood. New York: Wiley, 1976. (b)