TY  - BOOK
AU  - E. C. Wragg
TI  - Teaching mixed-ability groups
T2  - Teaching series
SN  - 0715368656
U1  - 373.125 W939t 
PY  - 1976///
CY  - London
PB  - David & charles (Holding) Limited
KW  -  Mixed ability grouping in education
KW  - Sekundarstufe
KW  - Unterricht
ER  -