M. Scaife, Y. Rogers, F. Aldrich, and M. Davies. CHI '97: Proceedings of the SIGCHI conference on Human factors in computing systems, page 343-350. New York, NY, USA, ACM Press, (1997)
A. Herrington, J. Herrington, and J. Mantei. New technologies, new pedagogies: Mobile learning in higher education, Faculty of Education, University of Wollongong, (2009)