6Ryan et al. Emotions in nondirected text learning. Individual Difference of Learning. 1990:1-17.
7Sadoski et al. Impact of concreteness on comprehensibility, interest and memory for text:Implications for dual coding theory and text design. Journal of EducationalPsychology. 1993:291-304.
8Hidi,S. Interest and its contribution as a mental resource for learning. Educational researchreview. 1990:549-571.
9Cordova et al.Intrinsic motivation and the processs of learning:Beneficial effects ofcontextualization, personalization, and choice. Journal of Educational Psychology, 1996:715-73.
10Hidi, S. Interest and its contribution as a mental resource for learning. Educational researchreview. 1990:549-571.
