Dzanurrahmana Zein, F, K Aimmatul Umah, K Asyaria, S Herianingrum, A Syifaul Qulub, and S Alif Rusmita. 2019. “Optimization of ISSI Stock Portfolio Using Single Index Models in 2013-2017”. KnE Social Sciences 3 (13), 346–361. https://doi.org/10.18502/kss.v3i13.4215.