Khoiri, N., and A. Nasution. “MUI Legal Fatwa on Vaccine Halalness in COVID-19 Vaccination Socialization in Medan City, Indonesia”. Al-Manahij: Jurnal Kajian Hukum Islam, vol. 16, no. 1, May 2022, pp. 15-28, doi:10.24090/mnh.v16i1.5146.