Richards, Jack C. <br/><br/>
Changes  2 student's book 

 - Cambridge  Cambridge University Press  1997 
 - 144 p.  29 cm. 
<br/><br/> English for International Communication 
<br/><br/><label>ISBN: </label>0521449308 
<br/><br/><label>Dewey Class. No.: </label>428 RIC