Swan, Michael <br/><br/>
How English works :  a grammar practice book : with answers / 
Michael Swan & Catherine Walter. 
 - Oxford :  Oxford University Press,  1997. 
 - 358 p. :  ill. ;  25 cm. 
<br/><br/><label>ISBN: </label>9780194314565 
<br/><br/><label>Subjects--Topical Terms: </label><br/>English language--Textbooks for foreign speakers