TY  - SOUND
AU  - Swan,Michael
AU  - Smith,Bernard
TI  - Learner English: a teacher's guide to interference and other problems 
SN  - 0521000246
PY  - 2001///
CY  - (Cambridge) New York
PB  - Cambridge University Press
KW  - Learning
KW  - English language
KW  - Study and teaching
ER  -