1. Civil Engineering;C. Ballinger,1990
2. Civil Engineering;P. Tarricone,1993
3. Proceedings of the Fifth Symposium of Engineering Databases: An Enterprise Resource, 1991 International Computers in Engineering Conference;B. Chadha,1991
4. Chen, P. P. (1976) The entity-relationship model?toward a unified view of data. Transactions on Database Systems, Vol. 1. Association for Computing Machinery, No. 1, 9?36, March
5. Nijssen, G. M. (1989) Conceptual Schema and Relational Dathase Design: A Fact Oriented Approach. Prentice Hall, New York