Dake, P., Lodo, R.Y. and Manek, A.O. 2026. Improving English Vocabulary Mastery Through Duolingo Application For Grade 5 At SD Inpres Kayu Putih. Jurnal Penelitian Ilmu Pendidikan Indonesia. 5, 1 (Apr. 2026), 840–845. DOI:https://doi.org/10.31004/jpion.v5i1.900.