T. Ley, B. Kump, A. Ulbrich, P. Scheir, und S. Lindstaedt. Proceedings of Ed Media 2008 World Conference on Educational Multimedia, Hypermedia & Telecommunications, Vienna, Austria, June 30-July 4, AACE, Chesapeake, VA, (2008)
T. Ley, S. Lindstaedt, und D. Albert. Professional Knowledge Management, Volume 3782 von Lecture Notes in Computer Science, Springer, Heidelberg, (2005)