Alimsyah, Surya, and Lin Prasetyani. “RANCANG BANGUN PENGONTROL MODUL GSM SIM300C BERBASIS MIKROKONTROLER PIC 18F452”. Technologic 3, no. 1 (December 18, 2015). Accessed November 22, 2024. https://technologic.polytechnic.astra.ac.id/index.php/firstjournal/article/view/112.