Sartono, K., M. Djamin, and S. Suryadi. “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, vol. 2, no. 09, Sept. 2024, pp. 1732-9, doi:10.58812/wsis.v2i09.1271.