Wahyuningsih, Puji, Karna Wijaya, Wega Trisunaryanti, Ady Mara, and Suheryanto. 2015. “Synthesis and Application of Alumina Pillared Bentonite Catalyst for Esterification of Acetic Acid With Different Alcohols”. Asian Journal of Chemistry 27 (4):1304-8. https://doi.org/10.14233/ajchem.2015.17670.