1. Adamo-Villani, N., Richardson, J., Carpenter, E., Moore, G.: A photorealistic 3d virtual laboratory for undergraduate instruction in Microcontroller Technology. In: 33rd SIGGRAPH 2006 (S. 21). ACM, New York (2006)
2. Agarwal, R., Karahanna, E.: Time flies when you’re having fun: cognitive absorption and beliefs about information technology usage. MIS Q 24, 665–694 (2000). doi:10.2307/3250951
3. Askwith, I.D.: Television 2.0: reconceptualizing TV as an engagement medium. Doctoral dissertation, Massachusetts Institute of Technology, Chicago (2007)
4. Attfield, S., Kazai, G., Lalmas, M., Piwowarski, B.: Towards a science of user engagement (Position Paper). In: WSDM Workshop on User Modeling for Web Applications (2011)
5. Bellur, S., Sundar, S.S.: Interactivity as conversation: Can back and forth interactions affect user cognitions and attitudes? Paper presented at the 63rd Annual Conference of the International Communication Association, London (2013)