E. Valentini, G. Fliess, und E. Haselwanter. Computer Software and Applications Conference, 2005. COMPSAC 2005. 29th Annual International, 2, Seite 219 - 222 Vol. 1. (Juli 2005)
J. Sorva, und T. Sirkiä. Proceedings of the 10th Koli Calling International Conference on Computing Education Research, Seite 49--54. New York, NY, USA, ACM, (2010)
C. de Souza, S. Quirk, E. Trainer, und D. Redmiles. Proceedings of the 2007 international ACM conference on Supporting group work, Seite 147--156. New York, NY, USA, ACM, (2007)