1. Association of American Colleges and Universities 2011 AAC&U Member Survey Findings http://www.aacu.org/membership/2009surveytalkingpoints.cfm
2. Allen , I. E. J. Seaman 2010 Learning on Demand: Online Education in the United States, 2009 http://sloanconsortium.org/publications/survey/pdf/learningondemand.pdf
3. Association of American Geographers 2009 http://www.aag.org/cs/ about aag/governance/statement
4. How does distance education compare with classroom instruction? A Meta-Analysis of the Empirical Literature;Bernard;Review of Educational Research Fall 2004,2004
5. Bologna Secretariat 2010 http://www.ond.vlaanderen.be/ hogeronderwijs/bologna/about/