K N Srinivasappa, A Nataraja, A A Farooqi, B S Sreeramu,. 2003. “Influence of Nitrogen, Phosphours and Potassium on Growth and Yield of Black Cumin (Nigella Sativa L.)”. Journal of Spices and Aromatic Crops 12 (1):51-54. https://updatepublishing.com/journal/index.php/josac/article/view/4742.