LIU, F.-J.; LU, C.-M. Design and Implementation of A Collaborative Educational Gamification Authoring System. International Journal of Emerging Technologies in Learning (iJET), [S. l.], v. 16, n. 17, p. pp. 277–289, 2021. DOI: 10.3991/ijet.v16i17.24087. Disponível em: https://online-journals.org/index.php/i-jet/article/view/24087. Acesso em: 19 jan. 2022.