Jessy, M.D., and Phebe Joseph. “Foliar Nutrient Resorption in Rubber Trees (Hevea Brasiliensis)”. Journal of Plantation Crops 40, no. 2 (August 12, 2012): 94–100. Accessed October 5, 2025. https://updatepublishing.com/journal/index.php/JPC/article/view/5877.