Soetisna, H. R., A. Widyanti, A. Syafira, and D. A. Pujiartati. “Risk Assessment During Covid-19 and Learning from Home: Evidence from University Students in Indonesia”. Jurnal Optimasi Sistem Industri, vol. 20, no. 1, May 2021, pp. 42-51, doi:10.25077/josi.v20.n1.p42-51.2021.