TY  - BOOK
AU  - Collins,J.D.
ED  - Murray 
TI  - Steps in understanding mathematics: teachers΄resource book ; J. D. Collins
SN  - 0719544556
U1  - 510 23
PY  - 1989///.
CY  - London: 
PB  - Murray, 
KW  - Mathematics
ER  -