Sudiyono, Widhiyo. 2021. “RISK AND RETURN MANAGEMENT OF SHARIA STOCKS IN JAKARTA ISLAMIC INDEX FOR THE PERIOD OF 2009 – 2019 USING MARKOWITZ PORTOFOLIO MANAGEMENT”. International Journal of Economics, Business and Accounting Research (IJEBAR) 5 (1):63-79. https://doi.org/10.29040/ijebar.v5i1.1699.