Hittayatullah, Hadif Fadlin, and MOHD ARIFF AHMAD NAZRI. “Case Study: Trend and Prediction of Water Quality Parameter in Sungai Sg. Petani, Kedah ”. Recent Trends in Civil Engineering and Built Environment, vol. 3, no. 1, Dec. 2021, pp. 937-44, https://penerbit.uthm.edu.my/periodicals/index.php/rtcebe/article/view/3182.