1. Anderson, T., Rourke, L., Garrison, D. R., & Archer, W. (2001). Assessing teaching presence in a computer conferencing context. Journal of Asynchronous Learning Networks, 5(2), 1-17.
2. Andrews, T., & Tynan, B. (2010). Why the student voice? The case for investigating the distance learners’ experience of ICT in distance education. In C. H. Steel, M. J. Keppel, P. Gerbic, & S. Housego (Eds.), Curriculum, technology & transformation for an unknown future. Proceedings ascilite Sydney 2010 (pp. 60-64). Retrieved February 19, 2014, from http://www.ascilite.org.au/conferences/sydney10/procs/Andrews-concise.pdf
3. Benbunan-Fich, R., & Hiltz, S. R. (2003). Mediators of the effectiveness of online courses. IEEE Transactions on Professional Communication, 46(4), 298-312.
4. CPED Consortium. (2014). Carnegie Project on the Education Doctorate. Retrieved February 19, 2014, from http://cpedinitiative.org/
5. Calandra, B., Barron, A. E., & Thompson-Sellers, I. (2008). Audio use in e-learning: What, why, when, and how?. International Journal on E-Learning, 7(4), 589-601.