Stallings, William <br/><br/>
Data and computer communications / 

 - 9th ed 
 - New Delhi,  Pearson,  c2014. 
 - ill. ;  864 p.   24 cm. 
<br/><br/><label>ISBN: </label>9789332518865 
<br/><br/><label>LC Class. No.: </label>19021-19027 
<br/><br/><label>Dewey Class. No.: </label>004.622