R. Garlick, and E. Cankaya. ITiCSE '10: Proceedings of the fifteenth annual conference on Innovation and technology in computer science education, page 165--168. New York, NY, USA, ACM, (2010)
B. Moskal, D. Lurie, and S. Cooper. SIGCSE '04: Proceedings of the 35th SIGCSE technical symposium on Computer science education, page 75--79. New York, NY, USA, ACM, (2004)