1. Allen, I.E. & Seaman, J. (2013). Changing course: Ten years of tracking online education in the United State. San Francisco, CA: Babson Survey Research Group and Quahog Research Group, LLC.
2. Social foundations of thought and action.;Bandura,1986
3. Engaging the online learner: Activities and resources for creative instruction;Conrad,2004
4. Adults as learners;Cross,1981
5. The systematic design of instruction;Dick,2005