Reference

1. https://en.wikipedia.org/wiki/Agile_software_development
2. Subhas misra, Vinod kumar and Uma kumar, Kamel fantazy, Mahmud akhter.2001.Agile software development practices: evolution, principles, and   criticisms
3. H. Frank Cervone. (2011). Understanding agile project management methods   using Scrum. OCLC Systems & Services: International digital library   perspectives, Vol. 27 Iss 1 pp. 18-22
4. Kiran Jammalamadaka, V Rama Krishna.2013. Agile Software Development And Challenges. IJRET : International Journal of Research in Engineering and  Technology
5. Subhas C. Misra dan Virender Singh.2013.Conceptualizing open agile software development life cycle (OASDLC) model. IJQRM : International Journal of Quality & Reliability Management.
6. Gaurav Kumar, Pradeep Kumar Bhatia.2012. Impact of Agile Methodology on Software Development Process. IJTEE : International Journal of Computer Technology and Electronics Engineering. Volume 2, issue 4
7. Abrahamsson, P., Salo, O., Ronkainen, J., & Warsta, J. (2002). Agile Software Development Methods: Review and Analysis. VTT Publications