1. Asymetrix Corporation, Washington, D.C.Using TOOLBOOK: A Guide to Building and Working with Books (Version 1,5), 1989.
2. A. Ballim and Y. Wilks: 1991, Beliefs, Stereotypes and Dynamic Agent Modeling.User Modeling and User-Adapted Interaction,1(1), 33?65.
3. I. Beaumont: 1994, User Modeling in the Interactive Anatomy Tutoring System ANATOM-TUTOR.User Modeling and User-Adapted Interaction,4(1), 21?45.
4. R. Binder: 1994, STED (StereoType EDitor): Ein Editor zur Erstellung und Verwaltung der Aktivierungs- und Deaktivierungsregeln von Stereotypen in BGP-MS. WIS Memo 13, WG Knowledge-Based Information Systems, Department of Information Science, University of Konstanz, Germany.
5. H. Böcker, H.-D. Hohl, and T. Schwab: 1990, GU? ADAPTep?p: Individualizing Hypertext. InHuman-Computer Interaction ? INTERACT'9O, pages 931?936, Amsterdam, The Netherlands.