HAKULINEN, L.; AUVINEN, T.; KORHONEN, A. The Effect of Achievement Badges on Students’ Behavior: An Empirical Study in a University-Level Computer Science Course. International Journal of Emerging Technologies in Learning (iJET), [S. l.], v. 10, n. 1, p. pp. 18–29, 2015. DOI: 10.3991/ijet.v10i1.4221. Disponível em: https://online-journals.org/index.php/i-jet/article/view/4221. Acesso em: 13 aug. 2022.