Naritoom, C., Bhanthumnavin, N., Simsiriwong, K., Trimongkolkul, P., Ngernprasertsri, N. and 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 (Jan. 1993), 71–79.