Farhi, lubna, zain Anwar Ali, and Saud Zia. “Multiple Colors Making System Using PLC”. Sir Syed University Research Journal of Engineering & Technology 8, no. 2 (March 29, 2019). Accessed May 2, 2024. https://sirsyeduniversity.edu.pk/ssurj/rj/index.php/ssurj/article/view/88.