Setiadji, Soni, Ridha Ulfah, and Ira Ryski Wahyuni. 2021. “Synthesis of SnO2 Using Hydrothermal Method and Its Application As Catalyst in Esterification of Oleic Acid”. Walisongo Journal of Chemistry 4 (2):90-96. https://doi.org/10.21580/wjc.v4i2.7911.