1. Class differences: Online education in the United States, 2010;Allen,2010
2. Conflicted: Faculty and online education, 2012;Allen,2012
3. Grade change: Tracking online education in the United States, 2013;Allen,2014
4. Assessing teaching presence in a computer conferencing context;Anderson;Journal of Asynchronous Learning Networks,2001
5. How much does “subject matter” matter? A study of disciplinary effects in on-line MBA courses;Arbaugh;The Academy of Management Learning and Education,2005