Roheli, R., Rahayu, D.A., Marcha, F. and Darmayanto, D. 2023. Implementation of Android-Based English Application System as Learning Tool for 6-12 Years Old Due to Covid-19. Journal of Research and Investigation in Education . 1, 1 (Apr. 2023), 7–11. DOI:https://doi.org/10.37034/residu.v1i1.4.