KUKREJA, A. K. “In Vitro Propagation Oflemon Balm (Melissa Officinalis L.) through Nodal Bud Culture of Adult Plant”. Journal of Spices and Aromatic Crops, vol. 8, no. 2, Dec. 1999, pp. 171-7, https://updatepublishing.com/journal/index.php/josac/article/view/4688.