P. Moorman, and E. Johnson. Proceedings of the 8th annual conference on Innovation and technology in computer science education, page 193--197. New York, NY, ACM, (2003)
M. Egan, and T. Lederman. Proceedings of the 16th annual joint conference on Innovation and technology in computer science education, page 318--322. New York, NY, ACM, (2011)
V. Isomöttönen, A. Lakanen, and V. Lappalainen. Proceedings of the 42nd ACM technical symposium on Computer science education, page 459--464. New York, NY, USA, ACM, (2011)