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

 - 9th ed. 
 - New Delhi :  Pearson Education,  2014. 
 - 964 p. :  ill. ;  25 cm. 
<br/><br/> Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>9789332518865 
<br/><br/><label>LC Class. No.: </label>21010-21021 
<br/><br/><label>Dewey Class. No.: </label>004.622  / STA