Kristian, Alex, Nuryuliani Nuryuliani, and Arif Rachman Hakim. “ALERT SYSTEM DESIGN MENGGUNAKAN TEKNOLOGI FIREBASE CLOUD MESSAGING (FCM)”. Jurnal Ilmiah Multidisiplin 3, no. 02 (March 31, 2024): 103–112. Accessed April 19, 2025. https://journal.admi.or.id/index.php/JUKIM/article/view/1601.