Ramadhani, A., Samsul, C.T.D.A. and Nuryanti, N. 2026. The Effect of Using Duolingo Application on Students’ Vocabulary Mastery . Journal of Language Learning and Assessment. 4, 2 (Aug. 2026), 66–71. DOI:https://doi.org/10.71194/jlla.v4i2.146.