Kato, Takashi. 2008. Linguistic Survey of Tibeto-Burman languages in Lao P.D.R. Tokyo: Institute for the Study of Languages and Cultures of Asia and Africa (ILCAA).
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Schliesinger, Joachim. 2003. Ethnic Groups of Laos. vol. 4. Sino-Tibetan-Speaking Peoples. White Lotus Press. Bangkok. (see pages 134-19).