1. Human-Computer Interaction Series;Scott
2. Joy Beatty Anthony Chen 2012. Visual Models for Software Requirements Redmond WA Microsoft Press Joy Beatty Anthony Chen 2012. Visual Models for Software Requirements Redmond WA Microsoft Press
3. Kent Beck. 1999. Extreme Programming Explained: Embrace Change. Addison-Wesley Longman Publishing Co. Inc. Boston MA USA Kent Beck. 1999. Extreme Programming Explained: Embrace Change. Addison-Wesley Longman Publishing Co. Inc. Boston MA USA
4. A Reference Method for User Story Requirements in Agile Systems Development