S. Fincher, S. Cooper, M. Kölling, и J. Maloney. SIGCSE '10: Proceedings of the 41st ACM technical symposium on Computer science education, стр. 192--193. New York, NY, USA, ACM, (2010)
G. Kacmarcik, и S. Kacmarcik. SIGCSE '09: Proceedings of the 40th ACM technical symposium on Computer science education, стр. 281--285. New York, NY, USA, ACM, (2009)