Yudono, B., Fatma, .-., Estuningsih, S. P., & Suganda, L. (2017). Oil Recovery of Soil Contained Petroleum Oil by Using Bio surfactant of Mixed Cultures Bacteria (Brevundumonas diminuta, Pseudomonas fluorescens, Pseudomonas aeroginosa, Pseudomonas citronelis) at vary pH Conditions (5-9). International Journal on Advanced Science, Engineering and Information Technology, 7(3), 858–864. https://doi.org/10.18517/ijaseit.7.3.2154