1. ISO CD 9241-210: Ergonomics of human-system interaction. Part 210: Human-centered design process for interactive systems. International Standardization Organisation (ISO), Geneva (2010)
2. Hassenzahl, M.: User Experience (UX): towards an experiential perspective on product quality. In: Proceedings of the 20th Conference on Human-Computer-Interaction, pp. 11–15. ACM, New York (2008)
3. Hassenzahl, M.: Experience Design – Technology for All the Right Reasons. Morgan & Claypool, Breiningsville (2010)
4. Burmester, M., Mast, M., Jäger, K., Homas, H.: Valence method for formative evaluation of user experience. In: Halskov, K., Graves Peters, M.G. (eds.) DIS2010 Proceedings, Århus, Denmark, 16–20 August, pp. 364–367. ACM, New York (2010)
5. Vanden Abeele, V., Zaman, B.: Laddering the user experience! In: User Experience Evaluation Methods in Product Development (UXEM 2009) – Workshop. INTERACT, Sweden, 24–28 August 2009