Alda, Muhamad. “Development of a Mobile-Based Student Grade Processing Application Using the Waterfall Method”. Ultimatics : Jurnal Teknik Informatika 15, no. 1 (July 7, 2023): 50-58. Accessed May 20, 2024. https://ejournals.umn.ac.id/index.php/TI/article/view/3134.