Citation:
Deterding, S. , Dixon, D. , Khaled, R. , & Nacke, L. . (2011). Proceedings of the 15th International Academic MindTrek Conference: Envisioning Future Media Environments, MindTrek 2011. From game design elements to gamefulness: Defining "gamification". Retrieved from http://www.scopus.com/inward/record.url?eid=2-s2.0-84860665893&partnerID=MN8TOARS
