The Effect of Duolingo Application Towards Students’ Vocabulary Mastery at the Seventh Grade Students of SMP Negeri 3 Belitang Mulya. Channing [Internet]. 2022 Jun. 12 [cited 2026 Jun. 4];6(2):43-8. Available from: https://journal.unuha.ac.id/index.php/Channing/article/view/1569