Putro, Dwi Purnomo, Indra Gunawan, and Puput Eka Suryani. 2022. “Software Push Notification Disposisi Persuratan Berbasis Website Menggunakan Firebase Cloud Messaging”. Journal of Information Technology Ampera 3 (3):370-81. https://journal-computing.org/index.php/journal-ita/article/view/330.