Thanwaporn Nakim และ Pattama Patpong. (2010) A discourse analysis of Thai historical texts from Sukhothai period to the present :|bsystemic functional approach. Mahidol University:ม.ป.ท.Thanwaporn Nakim และ Pattama Patpong. 2010. A discourse analysis of Thai historical texts from Sukhothai period to the present :|bsystemic functional approach. ม.ป.ท.:Mahidol University;Thanwaporn Nakim และ Pattama Patpong. A discourse analysis of Thai historical texts from Sukhothai period to the present :|bsystemic functional approach. ม.ป.ท.:Mahidol University, 2010. Print.