Ling, Michelle Wang Jing, Siti Marwanis Anua, and Nurzafirah Mazlan. 2019. “Concentrations of Magnesium, Calcium and Potassium in Drinking Water; A Comparison Between Tap Water and Bore Water”. Journal of Energy and Safety Technology (JEST) 2 (1). https://doi.org/10.11113/jest.v2n1.36.