Fakih, Taufik Muhammad, et al. “In Silico Activity Identification of Cyclo Peptide Alkaloids from Zizyphus Spina-Christi Species Against Sars-Cov-2 Main Protease”. Jurnal Biodjati, vol. 6, no. 1, June 2021, pp. 71-81, doi:10.15575/biodjati.v6i1.10603.