A. Sutcliffe. Proceedings of the 11th IEEE International Conference on Requirements Engineering, стр. 320--. Washington, DC, USA, IEEE Computer Society, (2003)
N. Kantola, и T. Jokela. Proceedings of the 19th Australasian conference on Computer-Human Interaction: Entertaining User Interfaces, стр. 49--56. New York, NY, USA, ACM, (2007)