Mephokee, C., A. Chonlapisan, and T. Roopsom. “International Trade Pattern between Thailand and Greater Mekong Sub-region Countries”. Thai Journal of East Asian Studies, vol. 16, no. 2, Sept. 2011, pp. 27-36, https://so02.tci-thaijo.org/index.php/easttu/article/view/51105.