Borisutdhi, Yos, Nipapan Wansri, Sommai Kaewmanee, Kanlaya Mikhama, and Suchint Simaraks. 2014. “Do We Really Understand Problems of Rubber Farmers With Small Areas in the Recent Extension Area in Upper Northeast Thailand?”. Kasetsart Journal of Social Sciences 35 (1):61-72. https://so04.tci-thaijo.org/index.php/kjss/article/view/247179.