1. BBC News. Profile: Edward Snowden, 2013. http://www.bbc.co.uk/news/world-us-canada-22837100 .
2. Guardian. Bradley manning prosecutors say soldier ‘leaked sensitive information’, 2013. http://www.guardian.co.uk/world/2013/jun/11/bradley-manning-wikileaks-trial-prosecution .
3. FBI. Robert Philip Hanssen Espionage Case, 2001. http://www.fbi.gov/about-us/history/famous-cases/robert-hanssen .
4. CSO Magazine, CERT Program (Carnegie Mellon University) and Deloitte. CyberSecurity Watch Survey: Organizations Need More Skilled Cyber Professionals To Stay Secure, 2011. http://www.sei.cmu.edu/newsitems/cybersecurity_watch{_}survey{_}2011.cfm .
5. Kroll and Economist Intelligence Unit. Annual Global Fraud Survey. 2011/2012, 2012.