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

 - 8th.  
 - New Delhi,  Prentice Hall,  c2007. 
 - xvii, 878 p. ;  ill. ;  23 cm.  
<br/><br/><label>ISBN: </label>9788120330788 
<br/><br/><label>Dewey Class. No.: </label>004.22