Pattama Patpong. (1997) The comparative study of lexical usage among three generations in Sukhothai dialect of Tambon Thungluang Amphoe Khirimat Sukhothai province. Mahidol University,:ม.ป.ท.Pattama Patpong. 1997. The comparative study of lexical usage among three generations in Sukhothai dialect of Tambon Thungluang Amphoe Khirimat Sukhothai province. ม.ป.ท.:Mahidol University,;Pattama Patpong. The comparative study of lexical usage among three generations in Sukhothai dialect of Tambon Thungluang Amphoe Khirimat Sukhothai province. ม.ป.ท.:Mahidol University, 1997. Print.