G C Yadav, Prem Nath, R C Jaiswal, R B Verma,. 2008. “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 17 (1):01-04. https://updatepublishing.com/journal/index.php/josac/article/view/4884.