TY  - BOOK
AU  - Torsten Husén
TI  - International study of achievement in mathematics; a comparison of twelve countries
T2  - a comparison of twelve countries
U1  - 153 H969i 
PY  - 1967///]
CY  - New York
PB  - Stockholm, Almqvist & Wiksell;, Wiley
KW  -  Mathematical ability
KW  - Mathematics
KW  - Study and teaching (Secondary)
KW  - Comparative education
ER  -