1. Benson, P.: Learner autonomy. TESOL Q. 47(4), 839–843 (2013)
2. Bista, S.K., Nepal, S., Colineau, N., Paris, C.: Using gamification in an online community. In: 2012 8th International Conference on Collaborative Computing: Networking, Applications and Worksharing (CollaborateCom), pp. 611–618. IEEE (2012)
3. Boticki, I., Baksa, J., Seow, P., Looi, C.K.: Usage of a mobile social learning platform with virtual badges in a primary school. Comput. Educ. 86, 120–136 (2015). http://www.sciencedirect.com/science/article/pii/S0360131515000688
4. Deterding, S., Khaled, R., Nacke, L., Dixon, D.: Gamification: toward a definition. In: CHI 2011, pp. 12–15 (2011). http://gamification-research.org/wp-content/uploads/2011/04/02-Deterding-Khaled-Nacke-Dixon.pdf
5. Dillenbourg, P., Järvelä, S., Fischer, F.: The evolution of research on computer-supported collaborative learning. In: Technology-Enhanced Learning, pp. 3–19 (2009)