DJVU PDF Theraphan L-Thongkum and Chommanad Intajamornrak. 2008, "Tonal evolution induced by language contact: A case study of the T'in (Lua') language of Nan province, northern Thailand", in The Mon-Khmer Studies Journal, vol. 38, pp. 57-68. cite.

DJVU PDF Theraphan L. Thongkum. 1997, "The place of Lawi Harak and Tariang within Bahnaric", in The Mon-Khmer Studies Journal, vol. 27, pp. 109-117. cite.

DJVU PDF Theraphan L. Thongkum. 1993, "A View on Proto-Mjuenic (Yao)", in The Mon-Khmer Studies Journal, vol. 22, pp. 163-230. cite.

DJVU PDF Theraphan L. Thongkum. 1992, "A preliminary reconstruction of Proto-Lakkja (Cha Shan Yao)", in The Mon-Khmer Studies Journal, vol. 20, pp. 57-90. cite.

DJVU PDF Theraphan L. Thongkum. 1987-1988, "The interaction between pitch and phonation type in Mon: phonetic implications for a theory of tonogenesis", in The Mon-Khmer Studies Journal, vol. 16-17, pp. 11-24. cite.

DJVU PDF Theraphan L. Thongkum. 1986, "An acoustic study of the register complex in Kui (Suai)", in The Mon-Khmer Studies Journal, vol. 15, pp. 1-20. cite.

DJVU PDF Theraphan L. Thongkum. 1979, "The distribution of the sounds of Bruu", in The Mon-Khmer Studies Journal, vol. 8, pp. 221-293. cite.