1. APA (1994) Diagnostic and Statistical manual of mental disorders, 4th edn. APA, Washington
2. Beck AT, Steer RA, Kovacs M, Garrison B (1985) Hopelessness and eventual suicide: a 10 year prospective study of patients hospitalised with suicidal ideation. Am J Psychiatry 145:559–563
3. Bloch S (1986) An introduction to the psychotherapies, 2nd edn. Oxford Univ Press, Oxford
4. Brown D, Pedder J (1979) Introduction to psychotherapy; an outline of psychodynamic principles and practice. Tavistock, London
5. Clarke AM, Clarke ADB, Berg JH (1985) Mental deficiency. The changing outlook, 4th edn. Methuen, London