1. American Society of Training and Development ASTD (2001) [Available On-line]
http://www.astd.org/astd
2. Ardito, C., Costabile, M.F, De Marsico, M., Lanzilotti, R., Levialdi, S., Roselli, T., Rossano, V.: An approach to usability evaluation of e-learning applications. Universal Access in Information Society 4, 20–283 (2006)
3. Beaudouin-Lafon, M.: Designing Interaction, not Interfaces. In: Proceedings of the working conference on Advanced visual interfaces, AVI 2004, Gallipoli, Italy, pp. 15–22. ACM Press, New York (2004)
4. Benyon, D., Crerar, A., Wilkinson, S.: Individual Differences and Inclusive Design. In: Stephanidis, C. (ed.) User Interfaces for All: Concepts, Methods, and Tools, pp. 21–47. LEA, Mahwah, New Jersey (2001)
5. Costabile, M., Marisco, M., Lanzilotti, R., Plantamura, V., Roselli, T.: On the usability evaluation of E-learning applications. In: Proceedings of the 38th Annual Hawaii International Conference on System Sciences (HICSS 2005) – Track 1 – vol. 01, 6.2 (2005)