Rahmawati, S. T. and Haryanto, H. (2026) “The Effect of Variations in the Concentration of Added Butyrum (milk fat) on the Making of Paper Soap and Organoleptic Properties: Sensory Tests and Product Stability”, Journal of Engineering Science and Technology Management (JES-TM), 6(1), pp. 214–222. doi: 10.31004/jestm.v6i1.419.