“Effectiveness of Sulfuric Acid and Hydrochloric Acid Catalysts in the Esterification of Frankincense Cinnamic Acid With Ethanol and Methanol”. Jurnal Pendidikan Kimia 16, no. 1 (April 30, 2024): 50–56. Accessed April 22, 2026. https://jurnal.unimed.ac.id/2012/index.php/jpk/article/view/53231.