Mohd Na’aim, Mohd Farid Bin, et al. “Synthesis of Ascorbic Acid Enhanced TiO2 Photocatalyst: Its Characterization and Catalytic Activity in CO2 Photoreduction”. Metallurgical and Materials Engineering, vol. 24, no. 1, Apr. 2018, pp. 1-16, doi:10.30544/327.