Stallings, William. <br/><br/>
Network security essentials :  applications and standards 

 - 6th edition. 
 - Harlow, United Kingdom, UNITED KINGDOM :  Pearson,  2017. 
 - 1 online resource  
<br/><br/><label>ISBN: </label>1292154918 9781292154916 9781292154855 (print)