1. Standards for educational and psychological testing;APA,1985
2. SCL-90. Handleiding bij een multidimensionele psychopathologie-indicator;Arrindell,1986
3. Experimental and quasi-experimental designs for research on teaching;Campbell,1963
4. A method of assessing change in a single subject: An alteration of the RC index;Christensen;Behavior Therapy,1986
5. Applied multiple regression /correlation analysis for the behavioral sciences;Cohen,1983