NIKOLOVA, A.; GEORGIEV, V.; MITREVA, E. Evaluation of Achievement Badges as a Gamification Method for Increasing Motivation in e-Learning. Digital Presentation and Preservation of Cultural and Scientific Heritage, [S. l.], v. 14, p. 241–248, 2024. DOI: 10.55630/dipp.2024.14.22. Disponível em: https://dipp.math.bas.bg/dipp/article/view/dipp.2024.14.22. Acesso em: 21 dec. 2024.