Thankamani, C.K., K. Kandiannan, M.S. Madan, V.K. Raju, S. Hamza, and K.S. Krishnamurthy. 2011. “Crop Diversification in Black Pepper Gardens With Tuber and Fodder Crops”. Journal of Plantation Crops 39 (3):358-62. https://updatepublishing.com/journal/index.php/JPC/article/view/5917.