TY  - BOOK
AU  - Heyneman Stephen P. etc.
TI  - Text books and achievement :  What we know
T2  - World Bank Staff Working Papers. 298
U1  - "T:520j2, L8/UN" 
PY  - 1978///
CY  - Washington
PB  - World Bank U. S. A.   
KW  -  Education
KW  - Educational Measurement
ER  -