1. Carpenter WT Jr, Heinrichs DW, Alphs LD (1985) Treatment of negative symptoms. Schizophr Bull 11: 440–452
2. Chouinard G, Ross-Chouinard A, Annable L, Jones BG (1980) The extrapyramidal symptom rating scale (ESRS). Can J Neurol Sci 7: 233
3. Jöreskog K, Sörbom D (1988). LISREL 7. SPSS Ine
4. Kay SR, Fiszbein A, Opler LA (1987) The positive and negative syndrome scale (PANSS) for schizophrenia. Schizophr Bull 13: 261–276
5. Marder SR, Meibach RC (1994) Risperidone in the treatment of schizophrenia. Am J Psychiatry 13: 25–40