AL-Sanabani, E. J., F. A. Alhadi, K. M. Al-Amary, and M. A. Hussain. 2018. “Effect of Cd and Pb on Germination and Early Seedling Growth of Black Seed (Nigella Sativa L.)”. University of Aden Journal of Natural and Applied Sciences 22 (1):87-97. https://doi.org/10.47372/uajnas.2018.n1.a07.