Madalageri, V. K. M. B. “Effect of Interaction of Nitrogen and Phosphorus on Seed and Essential Oil Yield of Ajowan (Trachyspermum Ammi L.) Genotypes”. Journal of Spices and Aromatic Crops, vol. 9, no. 2, Dec. 2000, pp. 137-9, https://www.updatepublishing.com/journal/index.php/josac/article/view/4562.