TY  - BOOK
AU  - Swan, Michael
TI  - Practical English usage (Thông trả 2007)
U1  - 428.2 
PY  - 1981///
CY  - Oxford ; New York
PB  - Heinle & Heinle
KW  - English language
KW  - Usage
N1  - 001175; K 045
ER  -