Utomo, Koko, Sopingi Sopingi, and Hanifah Permatasari. “Implementasi Geofencing Dan Notifikasi WhatsApp Real-Time Pada Sistem Informasi Presensi Siswa Berbasis Web”. Bulletin of Information System Research 4, no. 3 (August 31, 2026): 193-201. Accessed September 17, 2026. https://journal.grahamitra.id/index.php/bios/article/view/346.