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2. Introduction to Systematic Instructional Design for Traditional, Online, and Blended Environments. M. D. Roblyer. NJ: Pearson.
3. E-learning and the science of instruction. Richard Meyer and Ruth Clark. Wiley.
4. The design of learning environments’, Chap. 6 from How People Learn. J. D. Bransford, A. L. Brown and R. R. Cocking. National Academies Press.