1. Moss, S. C. , Emerson, E. , Kiernan, C. et al. (2000). Psychiatric symptoms in adults with learning disability and challenging behaviour. British Journal of Psychiatry, 177, 452–6.
2. Gardner, W. I. & Griffiths, D. (1997). Influence of psychiatric disorders on non-specific behavioural symptoms: diagnostic and treatment issues. In Congress Proceedings: International Congress III on the Dually Diagnosed, Mental Health Aspects of Mental Retardation, ed. Fletcher, R. J. & Dosen, A. New York, NY: National Association for the Dually Diagnosed.
3. Lowry, M. A. (1997). Unmasking mood disorders: recognising and measuring symptomatic behaviours. Habilitative Mental Healthcare Newsletter, 16, 1–6.
4. Emerson, E. & Bromley, J. (1995). The form and function of challenging behaviours. Journal of Intellectual Disability Research, 39, 388–98.
5. Jacobsen, J. W. (1982). Problem behaviour and psychiatric impairment within a developmentally disabled population: I. Behaviour frequency. Applied Research in Mental Retardation, 3, 121–39.