1. Benkler, Y.: Common Wisdom: Peer Production of Educational Materials. COSL Press, Utah State University, Utah (2005),
http://www.benkler.org/Common_Wisdom.pdf
2. Calverley, G., Shephard, K.: Assisting the Uptake of On-line Resources: Why Good Learning Resources Are Not Enough. Computers & Education 41, 205–224 (2003)
3. Collis, B., Strijker, A.: Technology and Human Issues in Reusing Learning Objects. Journal of Interactive Media in Education 4 (2004),
http://www-jime.open.ac.uk/2004/4/collis-2004-4.pdf
4. Nasatir, D., Henke, J., Lawrence, S., Miller, I., Perciali, I., Nasatir, D.: Use and Users of Digital Resources: A Focus on Undergraduate Education in the Humanities and Social Sciences. Center for Studies in Higher Education, UC Berkeley, Berkeley (2006),
http://cshe.berkeley.edu/research/digitalresourcestudy/report/digitalresourcestudy_final_report_text.pdf
5. Hylén, Jan: Open Educational Resources: Opportunities and Challenges. OECD’s Centre for Educational Research and Innovation, Paris, France (2006),
http://www.oecd.org/dataoecd/5/47/37351085.pdf