1.
Hernadijaya NS. The Use of Duolingo Application to Enhance English Vocabulary of Junior High School. RETAIN : J. Res. Engl. Lang. Teach. [Internet]. 2020 Jun. 2 [cited 2025 Jun. 29];8(2). Available from: https://ejournal.unesa.ac.id/index.php/retain/article/view/33055