G C Yadav, P. N. R. C. J. R. B. V. “Effect of Date of Sowing, Nitrogen Levels and Spacing on Growth and Yield of Ajwain (Trachyspermum Ammi (L.) Sprague)”. Journal of Spices and Aromatic Crops, vol. 17, no. 1, June 2008, pp. 01-04, https://updatepublishing.com/journal/index.php/josac/article/view/4884.