Masae, Mahamasuhaimi, Pichaya Pitsuwan, Chaturong Pholthawon, Niti Pawanwatcharakorn, Lek Sikong, and Peerawas Kongsong. 2015. “Synthesis of Na Doped TiO2 Nano Photocatalysts Film on Its Photoactivity and Hydrophilicity”. Science & Technology Asia 20 (2):63-71. https://ph02.tci-thaijo.org/index.php/SciTechAsia/article/view/35795.