Chung, Bonhee, Suchint Simaraks, และ John Caldwell. 2012. “Effects of an organic vegetable production on on-farm and off-farm income: A case study of farmer group in Nong Saeng village, Northeastern Thailand”. วารสารแก่นเกษตร 40 (2):189-96. https://li01.tci-thaijo.org/index.php/agkasetkaj/article/view/250617.