Gimbun, J., N. F. Ishak, N. I. S. Muhammad, S. F. Pang, M. A. A. Kadir, H. Ramli, M. F. Abdullah, Z. Giman, and Z. Khadisah. 2014. “Ultrasonic Assisted Extraction Polyphenols AndD Antioxidant from Nigella Sativa Seed”. Journal of Engineering and Technology (JET) 5 (2):17-26. https://jet.utem.edu.my/jet/article/view/157.