TY  - BOOK
AU  - Swan,Michael
AU  - Walter,Catherine
TI  - How English works: a grammar practice book with answers 
SN  - 9780194314565 (pbk.)
U1  - 420 
PY  - 2009///
CY  - New York
PB  - Oxford University Press, 
KW  - English Language
N1  - Includes index
ER  -