S. Frizell, и R. Hubscher. Proceedings of World Conference on E-Learning in Corporate, Government, Healthcare, and Higher Education 2002, стр. 298-304. Chesapeake, VA, AACE, (2002)
M. Derntl, и R. Motschnig-Pitrik. Proceedings of the 14th International Conference of the Society for Information Technology & Teacher Education (SITE03), стр. 2379-2382. Albuquerque, New Mexico, USA, (2003)
V. Barre, C. Chaquet, и H. El-Kechaï. Proceedings of Artificial Intelligence in Education: Workshop on Usage Analysis in Learning Systems, Amsterdam, (2005)