Unchalee Singnoi. 1988. A comparative study of Pray and Mal phonology. Faculty of Graduate Studies, Mahidol University;
Unchalee Singnoi. (1988) A comparative study of Pray and Mal phonology . Mahidol University/Bangkok.
Unchalee Singnoi. A comparative study of Pray and Mal phonology. . Bangkok:Mahidol University, 1988.
Unchalee Singnoi. (1988) A comparative study of Pray and Mal phonology . Mahidol University/Bangkok.