B B Vashishtha, S. K. M. “Response of Nigella (Nigella Sativa L) Variety NRCSS AN 1 to Different Agro-Tech- Niques”. Journal of Spices and Aromatic Crops, vol. 17, no. 2, June 2008, pp. 190-3, https://updatepublishing.com/journal/index.php/josac/article/view/4918.