Mu’afah, A. ., Tresnadewi, S. ., & Ariani, N. . (2021). Developing a Smartphone Application Prototype as Digital Supplementary Reading Materials for the Tenth Graders for Vocational High School. JoLLA: Journal of Language, Literature, and Arts, 1(2), 206–220. https://doi.org/10.17977/um064v1i22021p206-220