Sartono, Kajat, Martin Djamin, and Suryadi Suryadi , trans. “Design and Construction of Automatic Railway Crossing Gate Control Using Proximity and Infrared Sensors Based on Omron CP1E E30-SDRA PLC”. West Science Interdisciplinary Studies 2, no. 09 (September 25, 2024): 1732–1739. Accessed April 14, 2025. https://wsj.westsciences.com/index.php/wsis/article/view/1271.