1. Online form validation: Don’t show errors right away;Bargas-Avila,2003
2. An assessment of basic computer proficiency among active internet users: Test construction, calibration, antecedents and consequences;Bradlow;Journal of Educational and Behavioral Statistics,2002
3. Error messages: The neglected area of the man/machine interface;Brown;Communications of the ACM,1983
4. ISO-9241, 1996–2002. Ergonomic requirements for office work with visual display terminals (Parts 1–17). International Organization for Standardization.
5. Nielsen, J., 2001. Error message guidelines. Jakob Nielsen’s Alertbox. Available from: http://www.useit.com/alertbox/20010624.html.