1. Baddeley, A. (1998). Human memory. Boston: Allyn & Bacon.
2. Direct Measurement of Cognitive Load in Multimedia Learning
3. Cognitive Load Theory and the Format of Instruction
4. Clark, R. C. (1999). Developing technical training (2nd ed.). Washington, DC: International Society for Performance Improvement.
5. Clark, R. C. & Mayer, R. E. (2003). E-learning and the science of instruction. San Francisco: Jossey-Bass.