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

 - 3rd ed. 
 -  Prentice- Hall  2007 
 - 413 p 
<br/><br/><label>ISBN: </label>0- 13- 238033- 1 
<br/><br/><label>LC Class. No.: </label>TK 5105.59 .S725/