Optimalisasi Layanan Haji dan Umrah Menggunakan Auto Reply WhatsApp Business di Kementerian Agama Kabupaten Kuantan Singingi. MB [Internet]. 2026 Jan. 2 [cited 2026 Jul. 27];2(1):1-9. Available from: https://yasiinpublisher.org/index.php/mandalabakti/article/view/82