1. E-learning in the 21st century: A framework for research and practice;Anderson,2003
2. Assessing teaching presence in a computer conferencing context;Anderson;Journal of Asynchronous Learning Networks,2001
3. Introduction to e-learning research;Andrews,2007
4. Tutors and students without faces or places;Blake;Journal of Philosophy of Education,2000
5. From message posting to learning dialogues: Factors affecting learner participation in asynchronous discussion;Dennen;Distance Learning,2005