Swan, Michael. <br/><br/>
Practical english usage / 
Michael Swan. 
 -  Oxford University Press  1980 
 - xxiv, 339p.:22cm 
<br/><br/><label>ISBN: </label>0194421244 
<br/><br/><label>Subjects--Topical Terms: </label><br/>English Language-Grammar<br/>English Language-Textbooks For Foreign Speakersp<br/>English language--Usage