1. Alexander , Keith B. 2007 Warfighting in Cyberspace , Joint Forces Quarterly , 13 July accessed 20 March 2013, available at: http://www.military.com/forums/0,15240,143898,00.html; Internet .
2. What is Cyber Warfare?
3. Chertoff , Michael 2011 Statement of Record before the United States House of Representatives Subcommittee on Crime, Terrorism and Homeland Security , 15 November accessed 20 March 2013, available at: judiciary.house.gov/hearings/pdf/Chertoff%2011152011.pdf; Internet .