Dian Fatimatus Salwa, Tatiana Siska Wardani, and Bangkit Riska Permata, “Antibacterial Activity Test Of Extracts And Fractionsn-Hexane, Ethyl Acetate, And Pineapple Peel Water (Ananas Comosus(L.) Merr.) Against Bacteria Propionibacterium Acnes ATCC 6919”, IJHET, vol. 4, no. 6, Mar. 2026.