Harper, Allen <br/><br/>
Gray hat hacking :  the ethical hacker's handbook / 
Allen Harper, Shon Harris, Jonathan Ness. 
 - Third edition. 
 - New York :  McGraw-Hill,  c2011. 
 - xxiv, 693 pages :  illustrations ;  23 cm. 
<br/><br/>Includes bibliographical references and index.