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Purba, Nancy Angelia, and Marice Saragih. 2022. “PENINGKATAN HASIL BELAJAR BAHASA INGGRIS MELALUI APLIKASI DUOLINGO DALAM PEMBELAJARAN ONLINE DI TENGAH COVID-19 PADA SISWA SMP KATOLIK DELIMURNI DELITUA”. Jurnal Ilmiah Aquinas 5 (1):32-38. https://doi.org/10.54367/aquinas.v5i1.1585.