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

 - 4th ed. 
 -  Boston : Prentice Hall, c2011. 
 - xiv, 417 p. : ill. ; 24 cm. 
<br/><br/><label>ISBN: </label>9780137067923 (pbk. : international ed.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Computer networks -- Security measures. Computer security.