TY  - BOOK
AU  - Mullis , Ina V.S
AU  - Michael O. Martin, Graham J. Ruddock, Chistine Y. O'Sullivan and Corinna Preuschoff
TI  - TIMSS 2011 Assessment Frameworks: Trends international mathematics and science study
U1  - 500 23rd ed.
PY  - 2009///
CY  - Netherlands
PB  - TIMSS and PIRLS
KW  - TRENDS
ER  -