1. Atkins, D., Brown, J., & Hammond, A. (2007). A Review of the Open Educational Resources (OER) Movement: Achievements, Challenges, and New Opportunities.
2. Commonwealth of Learning. (2011). Guidelines for Open Educational Resoruces (OER) in Higher Education (p. 22). Vancouver. Retrieved from http://www.col.org/resources/publications/Pages/default.aspx..
3. Models for Sustainable Open Educational Resources;Downes;Interdisciplinary Journal of Knowledge and Learning Objects,2007
4. Friesen, N. (2010). Using Free and Open Online Resources. Retrieved from http://smallcities.tru.ca/index.php/cura/article/view/22..
5. The four “R“s of openness and ALMS analysis: Frameworks for open educational resources.;Hilton;Open Learning: The Journal of Open, Distance and e-Learning,2010