Siti Fitriyyatul Jamilah, Dwi Eko Waluyo and Amron Amron 2024. Optimizing Portfolios Using Single Index Models and Mean-Variance From the Indonesia Stock Exchange: IDX30. International Journal Of Accounting, Management, And Economics Research. 2, 2 (Nov. 2024), 14–30. DOI:https://doi.org/10.56696/ijamer.v2i2.132.