Herman, Herman, Anni Anggraeni, Abdul Mutalib, and Husein H. Bahti. “Synthesis and Characterization of Methyl Amino Polystyrene As Resin Material of Chromatography”. Journal of Tropical Pharmacy and Chemistry 4, no. 4 (January 18, 2019): 194-201. Accessed April 25, 2019. http://jtpc.farmasi.unmul.ac.id/index.php/jtpc/article/view/204.