Haryono, H. et al. 2017. BIODIESEL SYNTHESIS THROUGH NYAMPLUNG OIL ESTERIFICATION AND TRANSESTERIFICATION USING ULTRASONIC WAVES ASSIST. Jurnal Penelitian Saintek. 22, 1 (Aug. 2017), 1–7. DOI:https://doi.org/10.21831/jps.v22i1.15505.