Butar Butar, Ursula. M. R., and Erni Ekawati. 2022. “Covid-19 and Firm Performance in Relation to Level of Income and Investment - a Study in Indonesia and Singapore”. Fair Value: Jurnal Ilmiah Akuntansi Dan Keuangan 5 (5):2497-2509. https://doi.org/10.32670/fairvalue.v5i5.2753.