Robert A Kolvoord, D. H Uttal and N. G Meadow. "Using video case studies to assess the impact of the use of GIS on secondary students' spatial thinking skills" Proceedings of the International Conference on Spatial Thinking and Geographic Information Science, University of Tokyo, Tokyo, Japan. Procedia in Social and Behavioral Science Iss. 21 (2012)
Available at: http://works.bepress.com/bob_kolvoord/59/