Wahdaniah, Sabolakna, A., Ramadhanti, B., Ihsan, B. M., & Tjamin, Y. R. (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), 3001–3006. https://doi.org/10.29303/jppipa.v10i6.7175