DJVU PDF Theraphan L-Thongkum. 2001, "The Tai-Kadai peoples of Hainan Island and their languages", in Essays in Tai Linguistics, ed. M.R. Kalaya Tingsabadh and A.S. Abramson, pp. 189-204. Chulalongkorn University Press. cite.
DJVU PDF Weera, O. 1995, "Notes on Laha final -l", in Linguistics of the Tibeto-Burman Area, vol. 18, no. 1, pp. 173-181. cite.