AFIF NUR FITRIANTO 10.01.55.002110.01.55.0021. 2014. “SISTEM PAKAR UNTUK MENDETEKSI KERUSAKAN SISTEM OPERASI HANDPHONE BLACKBERRY BERBASIS WEB”. Information Technology and Telematics 4 (2). https://www.unisbank.ac.id/ojs/index.php/fti3/article/view/2751.