HELVY YUNIDA. PENGARUH PPKM DARURAT DAN PROTOKOL KESEHATAN 5 M TERHADAP PENURUNAN COVID-19 . Journal of Innovation Research and Knowledge, [S. l.], v. 1, n. 4, p. 547–556, 2021. DOI: 10.53625/jirk.v1i4.322. Disponível em: https://mail.bajangjournal.com/index.php/JIRK/article/view/322. Acesso em: 5 jul. 2025.