Oranuch Angkapakornkul และ Siriporn Wajjwalku. (2008) The role of Japan towards environmental issues :. Faculty of Political Science, Thammasat University,:ม.ป.ท.Oranuch Angkapakornkul และ Siriporn Wajjwalku. 2008. The role of Japan towards environmental issues :. ม.ป.ท.:Faculty of Political Science, Thammasat University,;Oranuch Angkapakornkul และ Siriporn Wajjwalku. The role of Japan towards environmental issues :. ม.ป.ท.:Faculty of Political Science, Thammasat University, 2008. Print.