Thomson, A. J. <br/><br/>
Practical English Grammar  4th edition 

 - New York:	  Oxford University,  1986. 
 - 383 (Rk#05 Sh#03) 
<br/><br/><label>ISBN: </label>9780194313483 
<br/><br/><label>Source: </label> Oxford University  PKR 885.81 
<br/><br/><label>Dewey Class. No.: </label>425