TY  - BOOK
AU  - Swan, Michael.
TI  - Practical English usage
SN  - 019567989X
U1  - 428.4 22 
PY  - 2005///
CY  - New Delhi : 
PB  - Oxford University Press
KW  - Language
KW  - English language Grammar -  Usage
N1  - English
ER  -