Mohd Jaswadi, Nurul Ismahani, et al. “Design and Development of Residential Estimated Bill Electricity Calculator Using Android Studio”. Evolution in Electrical and Electronic Engineering, vol. 4, no. 2, Oct. 2023, pp. 849-58, https://penerbit.uthm.edu.my/periodicals/index.php/eeee/article/view/13192.