TY  - BOOK
AU  - Gulliksen,Harold.
TI  - Theory of Mental Tests
U1  - 151.2 GUL 
PY  - 1950///
CY  - New York
PB  - John Wiley and Sons,Inc
KW  - Statistics,Errors of Measurement,Substitution and Prediction,Effect of Group Heterogeneity on Test Reliability
ER  -