Razak, Fathiah, and Mustaffa Anjang Ahmad. “GIS Mapping of Water Quality Index for Sungai Benut, Simpang Renggam ”. Recent Trends in Civil Engineering and Built Environment, vol. 4, no. 1, May 2023, pp. 051-8, https://penerbit.uthm.edu.my/periodicals/index.php/rtcebe/article/view/3259.