Firdaus, Ahmad, Shamila Azman, and . . “Improvement of Sungai Sebulung Water Quality Using Effective Microorganism”. International Journal of Engineering and Technology 7, no. 3.9 (July 9, 2018): 59–61. Accessed February 10, 2026. https://www.sciencepubco.com/index.php/IJET/article/view/15275.