Himanshu Patel and  R. T. Vashi,  A Study on Removal of Toluidine Blue Dye from Aqueous Solution by Adsorption onto Neem Leaf Powder.   journal   = {International Journal of Chemical and Molecular Engineering}, [online]. World Academy of Science, Engineering and Technology.
    October 2010, vol. 46(10). 674 - 679
    [viewed 21 January 2020]. Available from: https://publications.waset.org/pdf/2780.