Santosa, M. H. ., Pratama, I. P. S. . and Putra, I. N. A. J. . (2020) “Developing Android-Based English Vocabulary Learning Materials for Primary School Students”, JEELS (Journal of English Education and Linguistics Studies), 7(1), pp. 161–185. doi: 10.30762/jeels.v7i1.1467.