P. Ziegler, K. Dittrich, и E. Hunt. Proceedings of the 2008 IEEE 24th International Conference on Data Engineering Workshop, стр. 250--253. Washington, DC, USA, IEEE Computer Society, (2008)
J. Bennedssen, и M. Caspersen. Proceedings of the Fourth international Workshop on Computing Education Research, стр. 15--26. New York, NY, USA, ACM, (2008)