1. Albert D, Schrepp M. Structures and design of an intelligent tutoring system based on skill assignments. In: Albert D, Lukas J, editors. Knowledge spaces: theories, empirical research, and applications. Mahwah: Lawrence Erlbaum; 1999. p. 179–96.
2. Anderson JR. The expert module. In: Polson MC, Richardson JJ, editors. Foundations of intelligent tutoring systems. Hillsdale: Lawrence Erlbaum; 1988. p. 21–53.
3. Aviram A, Ronen Y, Somekh S, Winer A, Sarid A. Self-regulated personalized learning (SRPL): developing iClass’s pedagogical model. eLearning Papers. 2008;9(9):1–17.
4. Bannert M. Effects of reflection prompts when learning with hypermedia. J Educ Comput Res. 2006;35(4):359–75.
5. Berthold M, Lachmann P, Nussbaumer A, Pachtchenko S, Kiefel A, Albert D. Psycho-pedagogical mash-up design for personalising the learning environment. In: Ardissono L, Kuflik T, editors. Advances in user modeling, lecture notes in computer science, vol. 7138. Berlin: Springer; 2012. p. 161–75.