L. Schmidt, und O. Oehme. Computing Systems for Human Benefits: Proceedings of the 8th International Conference on Work With Computing Systems (Stockholm 2007), Seite 253–257. Stockholm, Royal Institute of Technology, (2007)
J. Moskaliuk, J. Kimmerle, und U. Cress. Proceedings of the International Conference of the Learning Sciences 2008(Bd. 2, S. 99-106). Utrecht, The Netherlands: International Society of the Learning Sciences, Seite 99-106. (2008)