1. Ruismäki, H., and Juvonen, A. (2011). Searching for a Better Life through Arts and Skills: Research Results, Visions and Conclusions, Department of Teacher Education, Faculty of Behavioural Sciences, University of Helsinki.
2. Darby, M. (2018). Challenges to Student Success in an Introductory Music Theory I Course. [Ph.D. Thesis, Walden University].
3. Deterding, S., Khaled, R., Nacke, L., and Dixon, D. (2011, January 7). Gamification: Toward a definition. Proceedings of the CHI 2011 Gamification Workshop Proceedings, Vancouver, BC, Canada.
4. Kapp, K. (2012). The Gamification of Learning and Instruction: Game-Based Methods and Strategies for Training and Education, Pfeiffer.
5. Teixes, F. (2015). Gamification: Fundamentals and Applications, Anglofort Ed.