1. MacKenzie, S.: Research Note: Within-subjects vs. Between-subjects Designs:Which to Use?. Toronto, Ontario, Canada (2002),
http://www.yorku.ca/mack/RN-Counterbalancing.html
2. Pallant, J.: SPSS Survival manual. McGraw-Hill, New York (2005)
3. Evers, V., Day, D.: The Role of Culture in Interface Acceptance. In: Human-Computer Interaction, Interact 1997, London (1997)
4. Constantine, L., Lockwood, L.: Software for Use: A Practical Guide to the Models and Methods of Usage-Centred Design. Addison-Wesley, New York (1999)
5. Barber, W., Badre, A.: Culturability: The Merging of culture and usability. In: Proceedings of the 4th Conference of Human Factors and the Web (1998)