Li, Dan, et al. “One Step Sol-Hydrothermal Synthesis of TiO2 Doped With CdS and N for Visible Light Photocatalytic Degradation of Organic Pollutant”. Asian Journal of Chemistry, vol. 27, no. 3, Jan. 2015, pp. 1066-70, doi:10.14233/ajchem.2015.18241.