1. Allen, I. E., & Seaman, J. (2015). Grade level: Tracking online education in the United States. Retrieved from http://www.onlinelearningsurvey.com/reports/gradelevel.pdf
2. A rose by any other name : Still distance education — a response to D. R. Garrison : Implications of online and blended learning for the conceptual development and practice of distance education.;T.Anderson;Journal of Distance Education,2009
3. Assessing teaching presence in a computer conferencing context.;T.Anderson;Journal of Asynchronous Learning Networks,2001
4. Do Chickering and Gamson’s seven principles also apply to online MBAs?;J. B.Arbaugh;The Journal of Educators Online,2006
5. Asynchronous discussion groups in teacher training classes: Perceptions of native and non-native students.;S.Biesenbach-Lucas;Journal of Asynchronous Learning Networks,2003