Marwan, M., Azuma, N., Maezawa, A. dan Uchida, S. (2003) “Characterization of Titania (TiO2) Catalysts Prepared by Sol-Gel Method”, 3(1), hlm. 26-33. Tersedia pada: https://jurnal.ugm.ac.id/v3/AJChE/article/view/7576 (Diakses: 8Juni2025).