Do pedagogical agents make a difference to student motivation and learning?, Educational Research Review, vol.6, issue.1, pp.27-54, 2011. ,
DOI : 10.1016/j.edurev.2010.07.004
The effects of video on cognitive load and social presence in multimedia-learning, Computers in Human Behavior, vol.24, issue.3, pp.786-797, 2008. ,
DOI : 10.1016/j.chb.2007.02.009
Cognitive principles of multimedia learning: The role of modality and contiguity., Journal of Educational Psychology, vol.91, issue.2, pp.358-368, 1999. ,
DOI : 10.1037/0022-0663.91.2.358
The social psychology of telecommunications, 1976. ,