Muhd Julkapli, N. “Impact of TiO2 Content on Titanium Oxide Supported Chitosan Photocatalytic System to Treat Organic Dyes from Wastewater”. Malaysian Catalysis-An International Journal, vol. 1, no. 1, Oct. 2021, pp. 1-14, http://adum.um.edu.my/index.php/MCIJ/article/view/27602.