TY  - BOOK
AU  - Wright, Tony
AU  - Candlin, C.N
AU  - Widdowson, H.G.
TI  - Roles of Teachers and Learners 
SN  - 0194371336
U1  - 407.2 
PY  - 1987///
CY  - Hong kong
PB  - Oxford University Press
KW  - Teaching and Learning
ER  -