Sudsawad Chuasuwan. (1990) A phonology of Nyah Kur at Ban Tha Duang, Petchabun province. Mahidol University,:ม.ป.ท.Sudsawad Chuasuwan. 1990. A phonology of Nyah Kur at Ban Tha Duang, Petchabun province. ม.ป.ท.:Mahidol University,;Sudsawad Chuasuwan. A phonology of Nyah Kur at Ban Tha Duang, Petchabun province. ม.ป.ท.:Mahidol University, 1990. Print.