Kassim Shaari, N. Z., and A. Q. A. Sajali. “Manganese in the Source of Groundwater in Malaysia and the Method for the Removal Process: A Review on the Adsorption and Membrane Separation Processes”. Malaysian Journal of Chemical Engineering &Amp; Technology, vol. 4, no. 1, May 2021, pp. 1-7, doi:10.24191/mjcet.v4i1.12811.