Unchalee Singnoi. (1988) A comparative study of Pray and Mal phonology. Mahidol University,:ม.ป.ท.Unchalee Singnoi. 1988. A comparative study of Pray and Mal phonology. ม.ป.ท.:Mahidol University,;Unchalee Singnoi. A comparative study of Pray and Mal phonology. ม.ป.ท.:Mahidol University, 1988. Print.