Theivarasu, C., and S. Mylsamy. 2012. “Adsorption Studies of Acid Blue-92 from Aqueous Solution by Activated Carbon Obtained from Agricultural Industrial Waste-Cocoa (Theobroma Cacao) Shell”. Asian Journal of Chemistry 24 (5):2187-90. https://asianpubs.org/index.php/ajchem/article/view/8976.