Weera Ostapirat. (1993) Proto-Hlai vowel system. Mahidol University,:ม.ป.ท. 10.14457/MU.the.1993.552
Weera Ostapirat. 1993. Proto-Hlai vowel system. ม.ป.ท.:Mahidol University,; 10.14457/MU.the.1993.552
Weera Ostapirat. Proto-Hlai vowel system. ม.ป.ท.:Mahidol University, 1993. Print. 10.14457/MU.the.1993.552