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