1. Rumbaugh, I. Jacobson and G. Booch, 2006 The Unified Modeling Language Reference Manual, Second Edition,.
2. N. H. Ali, Z. Shukur and S. Idris 2007. A Design of an Assessment System for UML Class Diagram, International Conference on Computational Science and Applications, Kuala Lumpur, (26-29 August) pp. 539-546.
3. R. Miles and K. Hamilton 2006. Learning UML 2.0 1st Edition, O’Reilly Media, Sebastopol, pp 288.
4. R. Borges and A. Mota 2003. Integrating UML and Formal Methods, Electronic Notes in Theoretical Computer Science, Vol. 84, pp. 97-112.
5. M. Brendan and J. S. Dong 1998. Blending Object-Z and Timed CSP: An Introduction to TCOZ, Proceedings of International Conference on Software Engineering, Kyoto, (19-25 April), and pp. 95-104.