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SmartDraw. (2011). Software design tutorials. Retrieved from http://www.smartdraw.com/resources/tutorials/data-flow-diagrams/#/resources/tutorials/Introduction-to-DFD
The following examples introduce an inventory system illustrating how process modeling with DFDs and data modeling with ERDs are constructed.
CSUB. (n.d.). DFD example. Retrieved form http://www.sims.monash.edu.au/subjects/cse1204/assets/lecture07.pdf
Creatively Diagraming and Collaboration. (2012). Ultimate guide to ER diagrams. Retrieved from http://creately.com/blog/diagrams/er-diagrams-tutorial/