Achmad, Putri Fatimah, Mukrim Mukrim, and Afrillia Anggreni. 2025. “THE USE OF DUOLINGO APPS TO IMPROVE STUDENTS’ VOCABULARY MASTERY OF SMP NEGERI 4 PALU”. E-Journal of ELTS (English Language Teaching Society) 13 (1):1027-34. https://doi.org/10.22487/elts.v13i1.4456.