Izzat Firdausi. “ANALISIS PORTOFOLIO OPTIMAL SYARIAH PASCA COVID-19 MELALUI MODEL INDEKS TUNGGAL”. Jurnal Manajemen, Bisnis dan Kewirausahaan 3, no. 3 (December 30, 2023): 107–123. Accessed April 4, 2026. https://www.journalshub.org/index.php/JUMBIKU/article/view/3621.