TY  - BOOK
AU  - Ruthven,Kenneth
TI  - The maths factory: a resource book for teachers 
SN  - 0521339286
U1  - 510.71 23
PY  - 1989///.
CY  - Cambridge: 
PB  - Cambridge University Press, 
KW  - Mathematics
KW  - Study and teaching
ER  -