Contact
Clark, R. C., & Mayer, R. E. (2003). E-learning and the science of instruction. Jossey-Bass/Pfeiffer: San Francisco, CA
Muller, Derek A.; Lee, Kester J.; and Sharma, Manjula D. (2008). Coherence or interest: Which is most important in online multimedia learning? Australasian Journal of Educational Technology 2008, 24(2), 211-221. Retrieved from http://www.ascilite.org.au/ajet/ajet24/muller.pdf
PDF links
http://edtech2.boisestate.edu/thayerm/513/Coherence%20Analysis%20Paper_Thayer.pdf