1. Diagnostic and statistical manual of mental disorders;American Psychiatric Association,2013
2. Beail N. (Ed.). (2016). Psychological therapies and people who have intellectual disabilities. Retrieved from British Psychological Society website: https://www1.bps.org.uk/system/files/Public%20files/id_therapies.pdf.
3. Understanding papers in clinical journals;Bowers,2014
4. The psychological and social needs of patients;British Medical Association,2011
5. Drama, psychotherapy and psychosis;Casson,2004