San, Setiawan, Welly Atikno, and Suratno Suratno. 2020. “Analisis Diskriminan Faktor Kecemasan Karyawan Menghadapi Dampak Pandemi Covid-19: Kasus Perusahaan Manufacturing Dan Jasa Survey”. Operations Excellence: Journal of Applied Industrial Engineering 12 (2). Jakarta, Indonesia:198-208. https://doi.org/10.22441/oe.2020.v12.i2.006.