1. Are badges useful in education? It depends upon the type of badge and expertise of learner;Abramovich;Educational Technology Research & Development,2013
2. Badges in social media: A social psychological perspective;Antin,2011
3. Engaging engineering students with gamification;Barata,2013
4. Improving participation and learning with gamification;Barata,2013
5. Gamification for smarter learning: Tales from the trenches;Barata;Smart Learning Environments,2015