Jayakody, Sandunika, and Sajitha Dishanka. “An Estimation of Technical Efficiency of Tea Smallholdings in Ratnapura District of Sri Lanka”. Journal of Social and Development Sciences 10, no. 4(S) (August 21, 2020): 1-11. Accessed May 3, 2024. https://ojs.amhinternational.com/index.php/jsds/article/view/2839.