N. H. Abdurahman, and H. A. Magdib. “Surfactant (UMP) for Emulsification and Stabilization of Water-in-Crude Oil Emulsions (W/O)”. Maejo International Journal of Energy and Environmental Communication, vol. 2, no. 2, May 2020, pp. 18-21, doi:10.54279/mijeec.v2i2.245027.