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. 289-348 ch. 4 ) . George Van Driem (2007) · In Encyclopedia of the World's Endangered Languages edited by Christopher Mosely · London and NewYork: Routledge

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

Personal Communication . Gregory Anderson (2012) ·

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