FERNANDO, Ivan. Dampak Covid-19 Terhadap Sistem Pembelajaran Di Indonesia. Jurnal Ilmu Ekonomi dan Sosial (JIES), Jakarta, Indonesia, v. 9, n. 3, 2020. DOI: 10.22441/jies.v9i3.9720. Disponível em: https://publikasi.mercubuana.ac.id/index.php/jies/article/view/9720. Acesso em: 3 jun. 2026.