WICARA PUTRA11.01.55.0041. 2015. “SISTEM INFORMASI MONITORING SALES (STUDI KASUS PADA PT. PENERBIT ERLANGGA MAHAMERU CABANG SEMARANG)”. Information Technology and Telematics 5 (1). https://www.unisbank.ac.id/ojs/index.php/fti3/article/view/3126.