Faisal, F. I., Z. Ruma, Anwar, H. Budiyanti, and U. D. Natsir. “Optimal Portfolio Formation With Single Index Method: Study on Stocks Listed in the IDX High Dividend 20 Index on the Indonesia Stock Exchange for Period 2019-2022”. Economics and Business Journal (ECBIS), vol. 1, no. 5, July 2023, pp. 569-78, doi:10.47353/ecbis.v1i5.62.