Annapurna Devi, N., C. Mohan Kumar, Y. Rama Naidu, and M. Narasimha Rao. 2010. “Production and Evaluation of Biodiesel from Sunflower (Helianthus Annus) and Nigerseed Oil (Guizotia Abyssinica)”. Asian Journal of Chemistry 18 (4):2951-58. https://asianpubs.org/index.php/ajchem/article/view/20713.