K. Falkner, N. Falkner, and R. Vivian. Proceeding of the 44th ACM Technical Symposium on Computer Science Education, page 227–232. New York, NY, USA, Association for Computing Machinery, (2013)
J. Moskaliuk, J. Kimmerle, and U. Cress. Proceedings of the International Conference of the Learning Sciences 2008, 2, page 99--106. Utrecht, The Netherlands: International Society of the Learning Sciences, Inc., (2008)
C. Lee. Learning in Doing: Social, Cognitive, and Computational Perspectives, Cambridge University Press, Cambridge University Press, 110 Midland Ave., Port Chester NY 10573-4930 (Cloth: ISBN-0-521-63095-9, \$55; paper: ISBN-0-521-63878-X, \$21). Tel: 800-872-7423; Fax: 914-937-4712., (2000)