Rerkrai, Direk, Yuwat Wootimatee, and Boonruam Napachot. “Evaluating Manpower Utllization in Rural Development (Poverty Area)”. Kasetsart Journal of Social Sciences 7, no. 1 (January 1, 1986): 34–47. accessed September 11, 2026. https://so04.tci-thaijo.org/index.php/kjss/article/view/243753.