C. Abras, D. Maloney-Krichmar, und J. Preece. Bainbridge, W. Encyclopedia of Human-Computer Interaction. Thousand Oaks: Sage Publications, 37 (4):
445-456(2004)
V. Devedzic, J. Good, A. Harrer, R. Luckin, D. Pearce, S. Retalis, und J. Robertson. Artificial Intelligence in Education - Building Technology Rich Learning Contexts that Work, Volume 158 von Frontiers in Artificial Intelligence and Applications, Seite 715. Amsterdam, IOS Press, (2007)