Kezia Nur Elizanti Purba, Diah Safitri Armin. The Effectiveness of the “Busuu Platform” in Improving the Writing Skills of 1st Grade Junior High School Students in Medan. Onoma [Internet]. 2025 Aug. 1 [cited 2025 Aug. 17];11(3):3452-60. Available from: https://e-journal.my.id/onoma/article/view/6611