Ponco, Agus, and Rezki Novrianti. 2013. “PEMBUATAN PROGRAM MESIN AIR LEAK TEST DAN MARKING MENGGUNAKAN PLC OMRON CPIE DI YUTAKA MANUFAKTUR INDONESIA”. Technologic 4 (2). https://technologic.polytechnic.astra.ac.id/index.php/firstjournal/article/view/53.