MULYADI SYAHPUTRA. DUOLINGO GAMIFICATION: DOES IT REDUCE STUDENTS’ GRAMMATICAL ERRORS IN WRITING?. Getsempena English Education Journal, [S. l.], v. 6, n. 1, p. 1–12, 2019. DOI: 10.46244/geej.v6i1.858. Disponível em: https://ejournal.bbg.ac.id/index.php/geej/article/view/858. Acesso em: 6 aug. 2026.