DJVU PDF Brown, J.M. 1979, "Vowel length in Thai", in Studies in Tai and Mon-Khmer Phonetics and Phonology In Honour of Eugénie J.A. Henderson, ed. T.L. Thongkum et al., pp. 10-25. Chulalongkorn University Press. cite.
DJVU PDF Brown, J.M. 1975, "The great tone split: did it work in two opposite ways?", in Studies in Tai Linguistics in Honor of William J. Gedney, ed. J.G. Harris and J.R. Chamberlain, pp. 33-48. Central Institute of English Language. cite.