1. Al-Ajlan, A.S. (2012). A comparative study between e learning features, methodologies, tools, and new developments for e learning. In E. Pontes (Ed.), Information system Management college of Business and Economics Qassim University Kingdom of Saudi Arabia (pp. 191-214). Intech, ISBN: 978953-51-0029-4, Retrieved 14 January, 2014 from http://cdn.intechweb.org/pdfs/27926.pdf.
2. Atutor, Retrieved 13 November, 2013 from http://www.atutor.ca.
3. Evaluation of an open source learning management system: Claroline;Awanga;Procedia - Social and Behavioral Sciences,2011
4. Berry, M. (2005). An investigation of the effectiveness of moodle in primary education. Retrieved 24 April, 2011 from http://moodlemoot.org/mod/page/view.php?id=19.
5. Botturil, L. (2004). Functional assessment of some open source LMS, (e lab report). University of Italian Switzerland. Retrieved 04 November, 2004 from www.instituti.usilu.net/botturil/web/publications/os_review_nov2004.pdf.