1. Anderson, R., Bohme, R., Clayton, R., Moore, T.: Security Economics and the Internal Market. ENISA (European Network and Information Security Agency). Shortened version: Security Economics and European Policy (March 2008)
2. Bank of America – Online Banking. SiteKey at Bank of America, http://www.bankofamerica.com/privacy/sitekey/
3. Bank of America. SafePass: Online Banking Security Enhancements, http://www.bankofamerica.com/privacy/index.cfm?template=learn_about_safepass
4. CA/Browser Forum, http://www.cabforum.org/
5. Chiasson, S.: Usable Authentication and Click-Based Graphical Passwords. PhD thesis, Carleton University, Ottawa, Canada (January 2009)