1. Assessing teaching presence in a computer conferencing context;Anderson;Journal of Asynchronous Learning Networks,2001
2. Observing interaction. An introduction to sequential analysis;Bakeman,1986
3. Learning of lurking? Tracking the “invisible” online student;Beaudoin;The Internet and Higher Education,2002
4. Chang, A. (2000). Cohen's Kappa (Data entry). Available: http://department.obg.cuhk.edu.hk/ResearchSupport/Cohen_Kappa_data.ASP.
5. Clarke, P. A., & Cronjé, J. C. (1998). Teaching “Teaching on the Internet” on the Internet. Available: http://hagar.up.ac.za/catts/abc/clarke&cronjec.doc.