Yusop, Noorrezam, et al. “A Recycling and Measurement of Floodwater Using Arduino, Potassium Alum and River Stone”. International Journal of Integrated Engineering, vol. 16, no. 4, Aug. 2024, pp. 162-9, https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/16334.