Istiqomah, Ananda, DAN 		Warsini, Sabar.
" Optimal Portfolio Formation Using Single Index Model on the IDX80 Index for the Period February 2021 – May 2022" <em>SAR (Soedirman Accounting Review) : Journal of Accounting and Business</em> [Online], Volume 7 Nomor 2 (30 December 2022)