TY  - BOOK
AU  - Husen Torsten Ed.
TI  - International study of achievement in mathematics : Comparison of twelve countries
T2  - International project for the evaluation of educational achievement IEA; 1
U1  - B, K78.1-;1 
PY  - 1967///
CY  - New York    
PB  -  John Wiley       
KW  - Mathematics
N1  - Bibliography p
ER  -