Shyamsundar Chaudhari, Salunke Mahesh, Nimbalker Arati, Nagre Sonali, and Prof. Gujarati T.V. “Automation Of Pad Printing Machine Using Programable Logic Controller”. International Journal of Advance Research in Engineering, Science & Technology, vol. 4, no. 5, May 2017, pp. 519-24, https://ijarest.org/index.php/ijarest/article/view/1564.