1. Carroll, J. & Thomas, J. (1988), “Fun”, ACM SIGCHI Bulletin
19(3), 21–4.
2. Clarkson, B., Mase, K. & Pentland, A. (2001), The Familiar: A Living Diary and Companion, in J. A. Jacko & A. Sears (eds.), Companion Proceedings of CHI2001: Human Factors in Computing Systems (CHI2001 Conference Companion), ACM Press, pp.271–2.
3. Fritz, J. & Fehr, W. (1993), Videospiele und ihre Typisierung, http://www.bpb.de/snp/referate/fritztyp.htm.
4. Glos, J. & Cassell, J. (1997), Rosebud: A Place for Interaction between Memory, Story and Self, in J. Marsh et al.(eds.), Proceedings of Cognitive Technologies’ 97, IEEE Publications, pp.88–97.
5. Hopson, J. (2001), Behavioral Game Design, http://www.gamasutra.com/features/20010427/hopson_01.htm.