G. Conole, P. McAndrew, und Y. Dimitriadis. Techniques for Fostering Collaboration in Online Learning Communities: Theoretical and Practical Perspectives, Hershey, New York, (2010)
M. Derntl, und R. Motschnig-Pitrik. Proceedings of the 14th International Conference of the Society for Information Technology & Teacher Education (SITE03), Seite 2379-2382. Albuquerque, New Mexico, USA, (2003)