TY  - BOOK
AU  - Hart,K.M.
AU  - Brown,M.L.
AU  - Kuchemann,D.E.
AU  - Kerslake,D.
AU  - Ruddock,G.
AU  - McCartney,M.
TI  - Children's Understanding of Mathematics: 11-16
SN  - 0-7195-3772-X
PY  - 1981///
CY  - London
PB  - John Murray
KW  - Mathematics
ER  -