Preeyaphan Udomprasert, Kitcha Urairong, Tawatchai Sakpuaram, and Worawidh Wajjwalku. “A Study on the Production Efficiency of 30 Commercial I. The Production Profile”. Agriculture and Natural Resources 28, no. 3 (September 30, 1994): 413–421. Accessed May 7, 2024. https://li01.tci-thaijo.org/index.php/anres/article/view/241429.