Achmad, P.F. , Mukrim, M. and Anggreni, A. 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 (Apr. 2025), 1027-1034. DOI:https://doi.org/10.22487/elts.v13i1.4456.