Mu’afah, A. , Tresnadewi, S. and 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 (Jun. 2021), 206–220. DOI:https://doi.org/10.17977/um064v1i22021p206-220.