Ilma, Shofana Fatkhatul, and Amalia Nuril Hidayati. “Analisis Pembentukan Portofolio Saham Optimal Pada Perusahaan Yang Terdaftar Di Jakarta Islamic Index (JII) Periode 2018 – 2021”. Journal of Economics and Management 2, no. 1 (April 30, 2024): 29–44. Accessed October 12, 2025. https://ejournal.publine.or.id/index.php/ecoma/article/view/37.