TY  - BOOK
AU  - Swan Michael
AU  - Smith B.
TI  - Learner English: a teacher's guide to interference and other problems 
SN  - 0521269105
U1  - 428.0071 
PY  - 1987///
CY  - USA
PB  - Cambridge University press
KW  - English language--Study and teaching
ER  -