1. 1. American Psychiatric Association (2000). Diagnostic and Statistical Manual of Mental Disorders, text revision: DSM-IV TR 4th edition. Washington DC: American Psychiatric Association Press.
2. 2. Brooksbank D. (1984). Management of conversion reactions in five adolescent girls. Journal of Adolescence, 21, 359-376
3. 3. Cardwell M. and Flanagan, C. (2005). Psychology A2: A Complete Companion. Nelson Thornes Publication.
4. 4. Fahn, S., Greene, P.E., Ford, B., Bressman, S.B. (1998). Handbook of movement disorders. Philadelphia
5. Current Medicine. As cited in Joseph, A.B., Young, R.R. (1999). Movement Disorders in Neurology and Neuropsychiatry. 2nd ed. Malden, MA: Blackwell Science.