References
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- Helmes , E. , Holden , R. R. and Howe , M. G. 1980 . An attempt at validation of the Minnesota Percepto-Diagnostic Test in a psychiatric setting . Journal of Clinical Neuropsychology , 2 : 231 – 236 .
- Lishman , W. A. 1978 . Organic psychiatry , Oxford : Blackwell Scientific Publishers .