Huotari, K., & Hamari, J. Defining Gamification - A Service Marketing Perspective(PDF). Proceedings of the 16th International Academic MindTrek Conference 2012, Tampere, Finland, October 3–5. 2012 [2015-03-04]. (原始内容(PDF)存档于2014-05-31).
Huotari, K., & Hamari, J. Defining Gamification - A Service Marketing Perspective(PDF). Proceedings of the 16th International Academic MindTrek Conference 2012, Tampere, Finland, October 3–5. 2012 [2015-03-04]. (原始内容(PDF)存档于2014-05-31).