Ratri, Arum Virgina Dewi Kusuma. “Analisis Portofolio Optimum Saham Syariah Dengan Model Black Litterman”. Jurnal Fourier 4, no. 1 (April 30, 2015): 1–15. Accessed February 2, 2026. https://fourier.or.id/index.php/FOURIER/article/view/31.