Wahdaniah, A. Sabolakna, B. Ramadhanti, B. M. Ihsan, and Y. R. Tjamin, “The Effect of Bay Leaf (Syzygium Polyanthum) Extract Hand Washing Liquid Soap Preparation on The Growth of Escherichia Coli Bacteria in Vitro”, jppipa, pendidikan ipa, fisika, biologi, kimia, vol. 10, no. 6, pp. 3001–3006, Jun. 2024.