References
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- Comprehensive Tests of Basic Skills. McGraw-Hill, New York 1970
- Raven J. C. Guide to the Standard Progressive Matrices. Lewis, London 1958
- Sheppard C., Fiorentino D., Collins L., Merlis S. Ravens Progressive Matrices (1938): Normative data on male narcotic addicts. Psychol. Rep. 1968; 23: 343–348