DJVU PDF Apiluck Tumtavitikul. 1997, "Reflection on the X' category in Thai", in The Mon-Khmer Studies Journal, vol. 27, pp. 307-316. cite.

DJVU PDF Apiluck Tumtavitikul. 1996, "The mid-central vowel [ə] in Thai", in The Mon-Khmer Studies Journal, vol. 26, pp. 65-77. cite.

DJVU PDF Apiluck Tumtavitikul. 1993, "Perhaps, the tones are in the consonants?", in The Mon-Khmer Studies Journal, vol. 23, pp. 11-41. cite.