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) ·

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

Glottolog . http://www.glottolog.org/glottolog/