TY  - BOOK
AU  - Swan,Michael
AU  - Walter,Catherine
TI  - How english works: a grammar practice book : with answers 
SN  - 0194314561
U1  - 425 21
PY  - 1997///
CY  - Oxford
PB  - Oxford University Press
KW  - English language
KW  - Textbooks for foreign speakers
KW  - Study and teaching
N1  - Includes index
ER  -