[1]
L. F. Cranor and S. Garfinkel, Security and usability: designing secure systems that people can use. Sebastopol, Calif: O’Reilly, 2005 [Online]. Available: http://www.vlebooks.com/vleweb/product/openreader?id=UCL&isbn=9780596514891
[2]
Bruce Schneier, Beyond fear. New York: Copernicus Books, 2003.