Pradit-Ukrit, Sawarin, Runchana Sinthavalai, and Napisphon Meemongkol. “Efficiency assessment of rubber plantation aid cooperation plants (RCOPs) in Songkhla province using data envelopment analysis (DEA)”. Asia-Pacific Journal of Science and Technology 18, no. 5 (April 13, 2017): 793–802. accessed April 22, 2026. https://so01.tci-thaijo.org/index.php/APST/article/view/82992.