References
- Anastasi , A. 1961 . Psychological Testing , New York : Macmillan .
- Fitts , W. H. 1972 . The Self-Concept and Performance , Nashville, Tenn. : Counselor Recordings & Tests .
- Jegede , R. O. 1975 . The self-concept of drug addicts , Ibadan, , Nigeria : University of Ibadan . Unpublished manuscript
- Jegede , R. O. 1976 . Psychometric attributes of the Psychological Effectiveness Scale . J. of Psychol. , 92 : 155 – 159 .
- Nunnally , J. C. 1967 . Psychometric Theory , New York : McGraw-Hill .
- Poe , C. A. 1973 . Internal consistency of a psychological effectiveness scale . Psychol. Rep. , 33 : 466
- Poe , C. A. 1973 . Development of a psychological effectiveness scale . J. of Psychol. , 85 : 81 – 85 .