DJVU PDF Ruengdet Pankhuenkhat. 2004, "Tai ortholinguisics: a case study of '຦ຠຢ' and 'ຫຍ~ຍ' in Lao x~xx and 'x' in Lanna script", in Papers from the Eleventh Annual Meeting of the Southeast Asian Linguistics Society, ed. S. Burusphat, Tempe, Arizona, pp. 519-527. Arizona State University, Program for Southeast Asian Studies. cite.

DJVU PDF Pankhuenkhat, R. 1996, "A comparative phonology of Tai Phake and Tai Kammueng", in The Fourth International Symposium on Language and Linguistics, Thailand, pp. 1998-2006. Institute of Language and Culture for Rural Development, Mahidol University. cite.