Wattanutchariya, Sarun, Sanit Kao-ian, and Vanlapa Vichachai. 1992. “Economic Analysis of Corn Production in Agribusiness Integration Project in Changwat Prachin Buri, Crop Year 1989/90”. Kasetsart Journal of Social Sciences 13 (2):115-29. https://so04.tci-thaijo.org/index.php/kjss/article/view/244055.