herwin, Herwin, and Khusaeri Andesa. “Implementation of Push Notification for Monitoring Motor Vehicle Tax Payments (Case Study: Samsat Siak)”. JURNAL TEKNOLOGI DAN OPEN SOURCE 6, no. 1 (June 22, 2023): 110 - 119. Accessed June 2, 2025. http://ejournal.uniks.ac.id/index.php/JTOS/article/view/3059.