JAMAL, P., Alam, M. Z., Zainuddin, E. A., & Nawawi, and W. M. F. W. (2011). Production of Biosurfactant in 2L Bioreactor Using Sludge Palm Oil as a Substrate. IIUM Engineering Journal, 12(4). https://doi.org/10.31436/iiumej.v12i4.212