S. Leutenegger, und J. Edgington. Proceedings of the 38th SIGCSE technical symposium on Computer science education, Seite 115--118. New York, NY, ACM, (2007)
C. Leska, und J. Rabung. Proceedings of the 9th annual SIGCSE conference on Innovation and technology in computer science education, Seite 237--237. New York, NY, ACM, (2004)