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http://eaula.sip.ucm.es
2. Abelson, H., Sussman, G.J.: Structure and Interpretation of Computer Programs, 2nd edn. MIT Press, Cambridge (1996)
3. Avgeriou, P., Papasalouros, A., Retalis, S., Skordalakis, M.: Towards a Pattern Language for Learning Management Systems. Educational Technology & Society 6(2), 11–24 (2003)
4. APIS (last visited, January 2006), more information available at
http://apis.sourceforge.net/
5. ASSIS (last visited, January 2006), more information available at
http://hull.ac.uk/esig/assis