Siti Maryam Rusly and  Shaliza Ibrahim,  Adsorption of Textile Reactive Dye by Palm Shell Activated Carbon: Response Surface Methodology.   journal   = {International Journal of Materials and Textile Engineering }, [online]. World Academy of Science, Engineering and Technology.
    July 2010, vol. 43(7). 441 - 444
    [viewed 23 October 2019]. Available from: https://publications.waset.org/pdf/2809.