1. Anastasi, A. and Urbing, S. (2005). Psychological Testing. Prentice Hall of India private limited New Delhi- 11001. Page No.365, 366,367.
2. Achenbach, T. M. (1991). Manual for the Children Behaviors Checklist / 6–18 1991 profile. Burlington, VT: University of Vermont, Department of Psychiatry.
3. American Psychiatric Association (1994). Diagnostic and statistical manual of mental disorder (4th Eds.). Washington DC: American Psychiatric Press
4. Adesoji, F.A. (2008). Students ability levels and effectiveness of problem solving instructional strategy, Journal of social science, Vol.17, No.1, pp. 5-8.
5. Anton, A. and Oscar, G. Rossier, J. and Garcla, L. F. (2005) E. l. Sevier personality and Individual Differences Aluja pip . Uales page 33, 713 ,