Stallings, William.  <br/><br/>
Network Security Essentials  applications and Standards 

 - 4th Ed. 
 - New Delhi  Pearson  2012 
 - 417p.  [112] 
<br/><br/><label>ISBN: </label>9788131761755 
<br/><br/><label>Dewey Class. No.: </label>005.8  / STA/NET