Hamzah, N., & Abd Aziz, N. A. (2024). Evaluation of Water Quality Index (WQI) in the Estuary of Sungai Ayam, Batu Pahat, Johor. Recent Trends in Civil Engineering and Built Environment, 5(1), 188-197. https://penerbit.uthm.edu.my/periodicals/index.php/rtcebe/article/view/7968