M. Bilal, M. . Sari Lubis, R. . Yuniarti, and H. . Munandar Nasution, “Formulation Of Anti-Acne Extract Aloe Vera (Aloe vera (L.) Burm.f.) In Hibiting The Activity Of Propionibacterium acnes ”, IJHP, vol. 3, no. 2, pp. 241–248, Sep. 2022.