Network security essentials/  Applications and standards.  Eng. 
William Stallings 
 - 3rd Ed. 
 - South Asia:  Dorling Kindersley,  2008. 
 - xiv,409.:  maps.;  24cm. 
<br/><br/><label>ISBN: </label>9788131716649 
<br/><br/><label>Dewey Class. No.: </label>681.14  / STA