Batmanlusi A, Tuerah IJC, Rorintulus OA. THE USE OF DUOLINGO TO IMPROVE STUDENTS’ VOCABULARY AT SMP NEGERI 8 SATU ATAP TONDANO . JoTELL [Internet]. 2024May18 [cited 2024Dec.22];3(5):542-5. Available from: https://ejurnal.unima.ac.id/index.php/jotell/article/view/9167