1. Halpin, T. 1998, ‘Object-Role Modeling (ORM/NIAM)’, Handbook on Architectures of Information Systems, Springer Heidelberg, Ch. 4.
2. Halpin, T. Conceptual Schema & Relational Database Design. 2nd edn, WytLytPub, 1999.
3. Halpin, T. 1999, ‘Fact-orientation before object-orientation: the case for data use cases’, DataToKnowledge Newsletter, vol. 27, no. 6.
4. Halpin, T. & Bloesch, A. 1999, ‘Data modeling in UML and ORM: a comparison’, Journal of Database Management, Idea group Hershey.
5. Lect Notes Comput Sci;A. Bloesch,1997