1. Kearns, R., Shead, S., Fekete, A.: A Teaching System for SQL, pp. 224–31 (2004)
2. Sadiq, S., Orlowska, M., Sadiq, W., Lin, J.: SQLator: An online SQL learning workbench. ACM SIGCSE Bull. 1–5. http://www.dl.acm.org/citation.cfm?id=1008055
3. de Raadt, M., Dekeyser, S., Lee, T.Y.: Do Students SQLify ? Improving Learning Outcomes with Peer Review and Enhanced Computer Assisted Assessment of Querying Skills, p. 101 (2007)
4. de Raadt, M.: Computer Assisted Assessment of SQL Query Skills, p. 63 (2007)
5. Soler, J., Prados, F., Boada, I., Poch, J.: A web-based tool for teaching and learning SQL. In: International Conference on Information Technology Based Higher Education and Training, ITHET. http://www.acme.udg.es/articles/ithet2006.pdf