Naritoom, C., Simsiriwong, K., Castella, J.-C., Trebuil, G., Saritniran, P., & Jantrprasert, J. (1991). On-Farm Diagnosis on the Intensification of Vegetable Cropping System for Exports to Improve the Sustainability of Small-Scale Farming Systems in Kamphaengsaen Area. Kasetsart Journal of Social Sciences, 12(2), 118–127. retrieved from https://so04.tci-thaijo.org/index.php/kjss/article/view/244001