Avianti, Jihan, and Martdian Ratnasari. 2021. “Analisis Pembentukan Portofolio Optimal Dengan Single Index Model Dan Z-Score Pada Emiten IDX BUMN 2O”. Journal of Emerging Business Management and Entrepreneurship Studies 1 (1):21-38. https://doi.org/10.34149/jebmes.v1i1.4.