1. Malone, T.W.: Toward a theory of intrinsically motivating instruction. Cognitive Science 5(4), 333–369 (1981)
2. Teo, C.B., Gay, R.K.L.: A knowledge-driven model to personalize e-learning. J. Educ. Resour. Comput. 6(1), 3 (2006)
3. Albert, D., Hockemeyer, C., Conlan, O., Wade, V.: Reusing adaptive learning resources. In: Proceedings of the International Conference on Computers in Education, ICCE, vol. 1, pp. 205–210 (2001)
4. Vassileva, D., Bontchev, B., Grigorov, S.: Mastering adaptive hypermedia courseware. Acta Electrotechnica et Informatica 9(1), 57–62 (2009)
5. Lecture Notes in Computer Science;A. Martens,2006