Amaniarsih, D.S. dkk. 2025. THE EFFECTIVENESS OF USING THE DUOLINGGO APPLICATION IN IMPROVING STUDENTS’ MOTIVATION AND ENGLISH-SPEAKING SKILL AT UNIVERSITAS POTENSI UTAMA MEDAN. Pedagogi: Jurnal Ilmiah Pendidikan. 11, 1 (Jan 2025), 46–54. DOI:https://doi.org/10.47662/pedagogi.v11i1.933.