Y. Kali, R. Levin-Peled, und Y. Dori. Computers in Human Behavior, 25 (5):
1067 - 1078(2009)Including the Special Issue: Design Patterns for Augmenting E-Learning Experiences.
D. Abrahamson, U. Wilensky, und J. Levin. Paper presented at the 2007 annual meeting of the American Educational Research Association, Chicago, IL, (2007)