1. P. Lawrence (Ed.), Workflow Handbook 1997, Workflow Management Coalition, Wiley, New York, 1997.
2. L. Fischer (Ed.), Workflow Handbook 2001, Workflow Management Coalition, Future Strategies, Lighthouse Point, FL, 2001.
3. Three good reasons for using a Petri-net-based workflow management system;van der Aalst,1998
4. W.M.P. van der Aalst, K.M. van Hee, Workflow Management: Models, Methods, and Systems, MIT Press, Cambridge, MA, 2002.
5. Modelling and enactment of workflow systems;Ellis,1993