Leaderboards or badges in two gamified forums: motivational and engagement differences. International Journal of Serious Games, [S. l.], v. 13, n. 1, p. 179–197, 2026. DOI: 10.17083/f1c2r712. Disponível em: https://journal.seriousgamessociety.org/~serious/index.php/IJSG/article/view/1089.. Acesso em: 30 jan. 2026.