Krissana Yodmongkhon. (1986) The phonological study of Northern Khmer (Prakhonchai district, Buriram province). Mahidol University,:ม.ป.ท.Krissana Yodmongkhon. 1986. The phonological study of Northern Khmer (Prakhonchai district, Buriram province). ม.ป.ท.:Mahidol University,;Krissana Yodmongkhon. The phonological study of Northern Khmer (Prakhonchai district, Buriram province). ม.ป.ท.:Mahidol University, 1986. Print.