Prakorb Phon-ngam. 1999. A morphological study of northern Khmer. Faculty of Graduate Studies, Mahidol University;
Prakorb Phon-ngam. (1999) A morphological study of northern Khmer . Mahidol University/Bangkok.
Prakorb Phon-ngam. A morphological study of northern Khmer. . Bangkok:Mahidol University, 1999.
Prakorb Phon-ngam. (1999) A morphological study of northern Khmer . Mahidol University/Bangkok.