Naritoom, C., Bhanthumnavin, N., Simsiriwong, K., Trimongkolkul, P., Ngernprasertsri, N., & Trebuil, G. (1993). Farming System Sustainability and Capital Accumulation : An Interpretation of Farmer Differentiation in Saiyok District of Kanjanaburi Province. Kasetsart Journal of Social Sciences, 14(1), 71–79. retrieved from https://so04.tci-thaijo.org/index.php/kjss/article/view/244088