1. Beynon-Davies, P. (1998). Information Systems Development: An Introduction to Information Systems Engineering. Basingstoke, Macmillan (now Palgrave).
2. Brodie, M.L., J. Mylopoulos and T.W. Schmidt (Eds) (1984). On Conceptual Modelling: Perspectives from Artificial Intelligence, Databases and Programming Languages. Berlin, Springer-Verlag.
3. Codd, E.F. (1970). A relational model for large shared data banks. Comm. of ACM 13(1): 377–87.
4. DBTG (1971). Report of the Codasyl Database Task Group, ACM.
5. Gray, J. (1996). The evolution of data management. IEEE Computer 38–46.