Anwar, Indah Lestari, Kasman Damang, and Erlina Pakki. “Comparison Analysis of Optimal Portfolio Formation on Jakarta Islamic Index 70 (JII70) (Markowitz Model and Single Index Model Approach)”. Advances in Social Sciences Research Journal 9, no. 5 (May 25, 2022): 224–241. Accessed November 29, 2024. http://558368.fgnqrw60.asia/index.php/ASSRJ/article/view/12379.