Singh, M. “Effect of Potassium on Growth and Yield of Patchouli [Pogostemon Cablin (Blanco) Benth.]”. Journal of Spices and Aromatic Crops, vol. 23, no. 1, June 2014, pp. 76-79, https://updatepublishing.com/journal/index.php/josac/article/view/5096.