DJVU PDF Prakorb Phon-Ngam. 1993, "The problem of aspirates in Central Khmer and Northern Khmer", in The Mon-Khmer Studies Journal, vol. 22, pp. 252-256. cite.

DJVU PDF Van der haak, F. 1993, "Ta’uaih phonology and orthography: a preliminary statement", in The Mon-Khmer Studies Journal, vol. 22, pp. 257-264. cite.