John, Alice, Y. Annamma Varghese, and Sadanand K. Mushrif. “Performance of Indigenous and Exotic Clones of Rubber in India”. Journal of Plantation Crops 37, no. 2 (July 27, 2009): 97–101. Accessed April 30, 2024. https://updatepublishing.com/journal/index.php/JPC/article/view/5946.