1. Atkinson, S. (2006). Factors influencing successful achievement in contrasting design and technology activities in higher education. International Journal of Technology and Design Education, 16, 193–213
2. Boeree, C. G. (2000). Gestalt psychology. http://webspace.ship.edu/cgboer/gestalt.html.
3. CalvoD’Mello, R. A. S. (2010). Affect detection: An interdisciplinary review of models, methods, and their applications. IEEE Transactions on Affective Computing, 57, 18–37
4. Canfield, W. (2001). ALEKS: A web-based intelligent tutoring system. Mathematics and Computer Education, 35, 152–158.
5. Chatti, M. A. (2010). Personalization in technology enhanced learning: A social software perspective. Shaker Verlag.