1. Bias, R., Hayhew, D.J.: Cost-Justifying Usability. AP Professional Cambridge, MA (1994)
2. Bevan, N., Kirakowski, J., Maissel, J.: What is usability? In: Proceedings of the 4th International Conference on HCI, pp. 651–655 (1991)
3. Krug, S.: Don’t Make Me Think!: A Common Sense Approach to Web Usability. New Riders Pub, Berkeley (2006)
4. Lorés, J., Sendín, M., Agost, J.: La interacción persona-ordenador. Jesús Lorés, Lleida (2001)
5. Molich, R., Nielsen, J.: Heuristic evaluation of user interfaces, Seattle, WA (1990)