Duchduen Bhanthumnavin. (2006) Sufficiency Economy Philosophy and Research Excellence. <i>NIDA Development Journal</i>, <i>46</i>(1), 1-19.Duchduen Bhanthumnavin. "Sufficiency Economy Philosophy and Research Excellence". NIDA Development Journal 46 (2006):1-19.Duchduen Bhanthumnavin. Sufficiency Economy Philosophy and Research Excellence. National Institute of Development Administration:ม.ป.ท. 2006.