Herman, H., A. Anggraeni, A. Mutalib, and H. H. Bahti. “Synthesis and Characterization of Methyl Amino Polystyrene As Resin Material of Chromatography”. Journal of Tropical Pharmacy and Chemistry, Vol. 4, no. 4, Jan. 2019, pp. 194-01, doi:10.25026/jtpc.v4i4.204.