Ratnawati, Nurul, Sukamto Sukamto, I Nyoman Ruja, and Neni Wahyuningtyas. 2020. “‘Defense of the Ancients’, Gamification in Learning: Improvement of Student’s Social Skills”. International Journal of Emerging Technologies in Learning (iJET) 15 (07):pp. 132-140. https://doi.org/10.3991/ijet.v15i07.13221.