1. Chapman, B. (2003). Blurring the lines between design and authoring: The Synergy Project 2002. [On-line]. Available: http://www.allencomm.com/ftp/pdfs/syn_proj.pdf. Accessed December 5, 2003.
2. CSSeTrain. (2002). ToolBook II assistant features. [On-line]. Available: http://www.cssetrain.com/products,toolbook_assistant,features,en.htm. Accessed December 5, 2003.
3. Economics LTSN. (2002). Software catalogue: Course management. [On-line]. Available: http://www.economics.ltsn.ac.uk/software/course_management.htm and http://www.economics.ltsn.ac.uk/software/course_management.htm. Accessed December 5, 2003.
4. Review of blackboard.com;Fulton;eLearn Magazine,2001
5. Component-based platform for a virtual university information system;Ganchev,2002