Abdul Kadir, Aslina, et al. “Potential of Using ROSA Centifolia to Remove Iron and Manganese in Groundwater Treatment”. International Journal of Sustainable Construction Engineering and Technology, vol. 3, no. 2, Nov. 2012, pp. 70-82, https://penerbit.uthm.edu.my/ojs/index.php/IJSCET/article/view/506.