Engebretson, Patrick (2011). The Basics of Hacking and Penetration Testing. Elsevier. pp. 19–22. ISBN 9781597496568. 9781597496568 ↩
Beaver, Kevin (2012). Hacking For Dummies. John Wiley & Sons. pp. 278, 280–281. ISBN 9781118380963. 9781118380963 ↩