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

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

Europe and North Asia ( pp. 211-282 ) . Tapani Salminen (2007) · In Encyclopedia of the World's Endangered Languages edited by C. Moseley · London & New York: Routledge

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

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) ·

Some observations on class categorization in Tsez ( pp. 125-139 ) . Comrie, Bernard and Polinsky, Maria (1999) · In Studies in Caucasian Linguistics: Selected Papers of the Eighth Caucasian Colloquium edited by van den Berg, Helma · Research School of Asian, African and Amerindian Studies (CNWS), Leiden University

Tsez . Alekseev, M. E. and Radzhabov, R. N. (2004) · In The Indigenous Languages of the Caucasus. Volume 3: The North East Caucasian Languages edited by Michael Job · Caravan Books

Valency-changing derivations in Tsez ( pp. 360-374 ) . Comrie, Bernard (2000) · In Changing valency edited by Dixon, R. M. W. and Aikhenvald, Alexandra Y. · Cambridge University Press