1. Wright, C.R., Lopes, V., Montgomerie, T.C., Reju, S.A.: Selecting a learning management system: advice from an academic perspective. EDUCAUSE Rev., 21 April 2014. http://www.educause.edu/ero/article/selecting-learning-management-system-advice-academic-perspective . Accessed 05 Feb 2015
2. Lynch, C.: Institutional Repositories: essential infrastructure for scholarship in the digital age, ARL Bimonthly Report, 226, United States, February 2003. http://www.arl.org/resources/pubs/br/br226/ . Accessed 05 Feb 2015
3. IEEE Standard for Learning Object Metadata, 1484.12.1TM (2002). http://dx.doi.org/10.1109/IEEESTD.2002.94128 . Accessed 05 Feb 2015
4. Advanced Distributed Learning: ADL Guidelines for Creating Reusable Content with SCORM 2004, July 2008. http://www.adlnet.gov/wp-content/uploads/2011/07/ADL_Guidelines_Creating_Reusable_Content.pdf . Accessed 05 Feb 2015
5. Wiley II, D.A.: Learning object design and sequencing theory. Ph.D. dissertation, Brigham Young University, United States, June 2000. http://opencontent.org/docs/dissertation.pdf . Accessed 07 Feb 2015