Selvamani, V., and V.P. Duraisami. 2014. “Identifying and Mapping Leaf Nutrient Based Constraints for Coconut Productivity in Coimbatore and Tiruppur Districts of Tamil Nadu State, India”. Journal of Plantation Crops 42 (2):163-69. https://updatepublishing.com/journal/index.php/JPC/article/view/5583.