V K Raju, S Hamza, K S Krishnamurthy, C K Thankamani, K Kandiannan, M S Madan,. 2012. “Feasibility of Intercropping Medicinal Plants in Black Pepper Garden”. Journal of Spices and Aromatic Crops 21 (2):113-17. https://updatepublishing.com/journal/index.php/josac/article/view/4986.