References
- Anastasi , A. 1989 . Psychological Testing, , 6th edn , New York : Macmillan .
- Aiken , L. R. 1988 . Psychological Testing and Assessment, , 6th edn , Boston, MA : Allyn & Bacon .
- Lord , F. M. and Novick , M. R. 1968 . Statistical Theories of Mental Test Scores , Reading, MA : Addison‐Wesley .
- Nunallv , J. C . 1978 . Psychometric Theory, , 2nd edn , New York : McGraw‐Hill .
- Dudek , F. J. 1979 . Psychol. Bull., , 2 : 335 – 337 .
- Primavera , L. H. and Gorman , B. S. 1994 . Int. J. Math. Educ. Sci. Technol. , 25 : 635 – 642 .