TY  - BOOK
AU  - Hart, Kathy M.
ED  - Concepts in Secondary Mathematics and Science
TI  - Children's understanding of mathematics : 11 - 16
SN  - 071953772X
AV  - QA11.C45 
PB  - John Murray
KW  - Mathematics - Study and teaching (Secondary)
KW  - QA
ER  -