Wahdaniah, Asep Sabolakna, Bella Ramadhanti, Bagus Muhammad Ihsan, and Yeremiah Rubin Tjamin. 2024. “The Effect of Bay Leaf (Syzygium Polyanthum) Extract Hand Washing Liquid Soap Preparation on The Growth of Escherichia Coli Bacteria in Vitro”. Jurnal Penelitian Pendidikan IPA 10 (6):3001-6. https://doi.org/10.29303/jppipa.v10i6.7175.