GUNALAN A/L P BALAN, and Dr Faiz Asraf Bin Saparudin. “Water Level Monitoring System for Paddy Field Irrigation”. Progress in Engineering Application and Technology, vol. 4, no. 2, Dec. 2023, pp. 394–402, https://publisher.uthm.edu.my/periodicals/index.php/peat/article/view/13200.