C. Linehan, B. Kirman, S. Lawson, and G. Chan. Proceedings of the 2011 annual conference on Human factors in computing systems, page 1979--1988. New York, NY, USA, ACM, (2011)
D. Stanton, C. O’Malley, K. Ng, M. Fraser, and S. Benford. Designing for change in networked learning environments: proceedings of the International Conference on Computer Support for Collaborative Learning 2003, page 293 – 302. (2003)