Putro, Agus Ponco, and Arief Priambudi. 2013. “SISTEM KONTROL MESIN SNAP RING CHECKER MENGGUNAKAN PLC TOYOPUC PC3J DI PT. TOYOTA MOTOR MANUFACTURING INDONESIA”. Technologic 4 (1). https://technologic.polytechnic.astra.ac.id/index.php/firstjournal/article/view/127.