Swan, Michael <br/><br/>
Practical English usage 

 - Oxford  Oxford University Press  1984 
 - xxiv,639p. 
<br/><br/><label>ISBN: </label> UKP 1.50 
<br/><br/><label>Source: </label> UKP 1.50 
<br/><br/><label>Dewey Class. No.: </label>420 SWA