Endangered Languages Catalogue Project. Compiled by research teams at University of Hawai'i Mānoa and Institute for Language Information and Technology (LINGUIST List) at Eastern Michigan University . (2012) ·

Ethnologue: Languages of the World, 16th Edition (2009) . (2009) · edited by M. Paul Lewis · SIL International http://www.ethnologue.com/

Atlas of the World’s Languages in Danger . Christopher Moseley (ed.) (2010) · UNESCO Publishing http://www.unesco.org/culture/en/endangeredlanguages/atlas

East and Southeast Asia ( pp. 349-424 ) . David Bradley (2007) · In Encyclopedia of the World's Endangered Languages edited by C. Moseley · London & New York: Routledge

World Oral Literature Project . http://www.oralliterature.org

Case studies of endangered languages in China (中國瀕危語言個案研究) . (2004) · edited by Qingxia Dai (戴慶廈) · Minzu Publisher (民族出版社)

Gelao-yu jianzhi (仡佬語簡志) [Brief guide to Gelao language] ( pp. 107 ) . He, Jiashan and Luo, Meizhen (1983) · Zhongguo shaoshu minzu yuyan jianzhi congshu (中國少數民族語言簡志叢書) · Beijing: National Minorities Publishing House

Proto-Kra ( pp. 1-251 ) . Ostapirat, Weera (2000) · Linguistics of the Tibeto-Burman Area. 23.1 http://sealang.net/sala/archives/pdf8/weera2000proto.pdf