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) ·

South Asia and the Middle East ( pp. 283-348 ) . George van Driem (2007) · In Encyclopedia of the World's Endangered Languages edited by Christopher Moseley · London & New York: Routledge

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

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