DJVU PDF Chamberlain, J.R. 1998, "The origin of Sek: implications for Tai and Vietnamese history", in The International Conference on Tai Studies, ed. S. Burusphat, Bangkok, Thailand, pp. 97-128. Institute of Language and Culture for Rural Development, Mahidol University. cite.

DJVU PDF Diller, A.V.N. 1988, "Tai scripts and Proto-Tai: the case of palatal continuants", in The International Symposium on Language and Linguistics, ed. C. Bamroongraks et al., Bangkok, Thailand, pp. 228-247. Thammasat University. cite.

DJVU PDF Gedney, W.J. 1989, "Evidence for another series of voiced initials in Proto-Tai", in Selected Papers on Comparative Tai Studies, ed. R.J. Bickner et al., pp. 229-270. Center for South and Southeast Asian studies, the University of Michigan. cite.

DJVU PDF Hartmann, J.F. 1992, "Tai Dam poetics and Proto-Tai tone categories", in Papers on Tai languages, Linguistics, and Literatures, ed. C.J. Compton and J.F. Hartmann, pp. 262-277. Center for Southeast Asian Studies, Northern Illinois University. cite.

DJVU PDF Li, F.-K. 1989, "Proto-Tai *kh and *x-", in South-east Asian Linguisitics: Essays in Honour of Eugénie J.A. Henderson, ed. J.H.C.S. Davidson, pp. 143-146. School of Oriental and African Studies, University of London. cite.

DJVU PDF Luo Yongxian. 1997, "Expanding the Proto-Tai Lexicon–a Supplement to Li (1977)", in The Mon-Khmer Studies Journal, vol. 27, pp. 271-298. cite.

DJVU PDF Sarawit, M. 1975, "Some changes in the final component of the Tai syllable", in Studies in Tai Linguistics in Honor of William J. Gedney, ed. J.G. Harris and J.R. Chamberlain, pp. 316-328. Central Institute of English Language. cite.

DJVU PDF Strecker, D. 1982, "Proto-Tai vowels revisited: a comparison and critique of the work of Sarawit and Li", in Linguistics of the Tibeto-Burman Area, vol. 7, no. 2, pp. 33-74. cite.