K. Borau, C. Ullrich, J. Feng, und R. Shen. Advances in Web Based Learning - ICWL 2009, 8th International Conference, Aachen, Germany, August 19-21, 2009. Proceedings, Volume 5686 von Lecture Notes in Computer Science, Seite 78-87. Springer, (2009)
M. Böhringer, und S. Barnes. Proceedings of the 17th European Conference on Information Systems (ECIS), Verona, Italy, June 08-10, 2009, Seite in press. (2009)