Usman, U. (2022). Comparison Analysis Of Optimal Portfolio With The Capital Asset Pricing Model (CAPM) Before And During The Covid-19 Pandemic : Study on Liquid-45 Index Stock Period 2018-2021. AJIRSS: Asian Journal of Innovative Research in Social Science, 1(3), 89–97. https://doi.org/10.53866/ajirss.v1i3.157