Rokhmalia, Fitri, and Pratiwi Hermiyanti. “A Concentrations Of PH, Chromium, and MPN Coliform Parameters in Alkaline Water”. International Journal of Advanced Health Science and Technology 2, no. 5 (October 27, 2022): 321–328. Accessed December 13, 2024. https://www.ijahst.org/index.php/ijahst/article/view/167.