BUWANA, R. (2016). MEMBANGUN CUSTOMER RELATIONSHIP MANAGEMENT (CRM) MENGGUNAKAN SMS CENTER BERBASIS SMS GATEWAY MENGGUNAKAN PHP (STUDI KASUS RSI SULTAN AGUNG SEMARANG). Information Technology and Telematics, 6(1). Retrieved from https://www.unisbank.ac.id/ojs/index.php/fti3/article/view/3867