N. Weibel, A. Fouse, E. Hutchins, и J. Hollan. Proceedings of the 16th International Conference on Intelligent User Interfaces, стр. 257--266. New York, NY, USA, ACM, (2011)
K. Everitt, S. Klemmer, R. Lee, и J. Landay. CHI '03: Proceedings of the SIGCHI conference on Human factors in computing systems, стр. 553--560. New York, NY, USA, ACM, (2003)