TY  - BOOK
AU  - Swan, Michael 
TI  - Practical english usage
SN  - 9780195679892
U1  - 428 Sw24p3 
PY  - 2005///
CY  - New Delhi
PB  - Oxford University Press
KW  - English language
KW  - Usage
KW  - Grammar
KW  - Vocabulary
ER  -