Chasanah, Sri Istiyarti Uswatun, et al. “ANALISIS PEMBENTUKAN PORTOFOLIO OPTIMAL SAHAM-SAHAM JAKARTA ISLAMIC INDEX (JII) PADA MASA PANDEMI COVID-19”. Jurnal Saintika Unpam : Jurnal Sains Dan Matematika Unpam, vol. 3, no. 1, July 2020, pp. 52-67, doi:10.32493/jsmu.v3i1.5649.