Efendy, Vievin, Kristian Adi Nugraha, and Danny Sebastian. “Implementasi Chat Room Dan Push Notification Pada E-Class Berbasis Mobile”. Jurnal Teknik Informatika dan Sistem Informasi 5, no. 2 (September 3, 2019). Accessed May 27, 2024. https://journal.maranatha.edu/index.php/jutisi/article/view/1763.