http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=6758978

http://people.uta.fi/~kljuham/2014-hamari_et_al-does_gamification_work.pdf

https://www.researchgate.net/publication/256743509_Does_Gamification_Work_-_A_Literature_Review_of_Empirical_Studies_on_Gamification

This paper reviews peer-reviewed empirical studies on gamification. We create a framework for examining the effects of gamification by drawing from the definitions of gamification and the discussion on motivational affordances. The literature review covers results, independent variables (examined motivational affordances), dependent variables (examined psychological/behavioral outcomes from gamification), the contexts of gamification, and types of studies performed on the gamified systems.