Prawonwan Saipan. (2007) The adoption of high efficiency kilns of people in the north eastern area. Mahidol University,:ม.ป.ท.Prawonwan Saipan. 2007. The adoption of high efficiency kilns of people in the north eastern area. ม.ป.ท.:Mahidol University,;Prawonwan Saipan. The adoption of high efficiency kilns of people in the north eastern area. ม.ป.ท.:Mahidol University, 2007. Print.