Formulation of Creams Containing Active Fraction of Cassia fistula L. Barks and its Antibacterial Activity against Propionibacterium acnes and Pseudomonas aeruginosa, Chaerunisaa, Anis Yohana, Muhaimin Muhaimin, Susilawati Yasmiwar, and Milanda Tiana , Pharmacognosy Journal, June 2020, Volume 12, Issue 4, p.920-928, (2020)