Tangkelangi NI, Upa R, Sudirman AM. Exploring Students’ Perceptions of Duolingo: Engagement, Motivation, and Self-Confidence. DJPBS [Internet]. 2026Aug.31 [cited 2026Oct.7];6(3):4127-34. Available from: https://www.dmi-journals.org/deiktis/article/view/4376