1. Data Flow Diagram - DFD. (n.d.). Retrieved August 30, 2014, from http://dataflowdiagram.blogspot.co.il/2009/10/what-is-dfd-or-what-is-data-flow.html.
2. Integrating Systems Analysis and Project Management tools;Gelbard;International Journal of Project Management.,2002
3. Gelbard R., Kantor J. & Edelist L. (2008), Integrating Software Engineering and Costing Aspects within Project Management Tools. In, Cartelli A. & Palma M. (Eds.), Encyclopedia of Information and Communication Technologies, 443-456.
4. Introduction to OMG's Unified Modeling Language™ (UML®). (n.d.). Retrieved August 29, 2014, from http://www.omg.org/gettingstarted/what_is_uml.htm.
5. SAP Sybase PowerDesigner. (n.d.). Retrieved August 29, 2014, from http://www.sybase.com/products/modelingdevelopment/powerdesigner.