Esa Kujansuu, Marko Kulmala. Codewitz: producing interactive elearning material for beginners in programming. In Vassilios Dagdilelis, Maya Satratzemi, David Finkel, Roger D. Boyle, Georgios Evangelidis, editors, Proceedings of the 8th Annual SIGCSE Conference on Innovation and Technology in Computer Science Education, ITiCSE 2003, Thessaloniki, Greece, June 30 - July 2, 2003. pages 266, ACM, 2003. [doi]