Mahamad Maifiah, M. H., and W. N. E. S. . Wan Ismail. “Porcine And Bovine-Derived Ingredients: Islamic Rules in Halal Pharmaceutical Products”. Journal of Fatwa Management and Research, vol. 28, no. 3, Sept. 2023, pp. 41-57, doi:10.33102/jfatwa.vol28no3.549.