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Purba NA, Saragih M. PENINGKATAN HASIL BELAJAR BAHASA INGGRIS MELALUI APLIKASI DUOLINGO DALAM PEMBELAJARAN ONLINE DI TENGAH COVID-19 PADA SISWA SMP KATOLIK DELIMURNI DELITUA . AQUINAS [Internet]. 2022Feb.4 [cited 2025Apr.18];5(1):32-8. Available from: https://ejournal.ust.ac.id/index.php/Aquinas/article/view/1585