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

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

Encyclopedia of the World's Endangered Languages . Christopher Moseley (2007) · Routledge

UNESCO Red Book of Endangered Languages . B. Heine and M. Brenzinger (2003) · UNESCO

The Red Book of the Peoples of the Russian Empire . (1993) · edited by Andrew Humphreys and Krista Mits · http://www.eki.ee/books/redbook

The World Atlas of Language Structures . (2005) · edited by Bernard Comrie and David Gil and Martin Haspelmath and Matthew S. Dryer · Oxford University Press

Kategorija mnozhestvennogo chisla imen sushchestvitel'nykh v chamalinskom jazyke (semanticheskij aspekt) ( pp. 131-135 ) . Magomedova, P. T. (1985) · In Kategorija chisla v dagestanskix jazykax edited by Mikailov K.Sh. · n. p.