Pribadi, Frita Ayu. “Implementation of an Emergency Community Restriction Policy (PPKM Darurat) for COVID-19 Mitigation in Surabaya”. KnE Social Sciences 7, no. 5 (March 15, 2022): 89–100. Accessed October 12, 2025. https://knepublishing.com/index.php/KnE-Social/article/view/10542.