DJVU PDF Wanna Tienmee. 1992, "Classification by tone shapes and patterns of tonal splits and coalescences [Thai dialects of Thailand]", in The Mon-Khmer Studies Journal, vol. 21, pp. 229-236. cite.

DJVU PDF Thomas, D. and Wanna Tienmee. 1987-1988, "An acoustic study of Northern Khmer vowels", in The Mon-Khmer Studies Journal, vol. 16-17, pp. 99-108. cite.