Ardi, Syahril, and Cokro Siamdani. 2015. “CONTROL SYSTEM DESIGN OF THE MACHINE PUMP INSPECTION USING PLC-LG GLOFA G7M DR60A IN PT XYZ”. Technologic 3 (1). https://technologic.polytechnic.astra.ac.id/index.php/firstjournal/article/view/121.