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

South America ( pp. 103-196 ) . Mily Crevels (2007) · In Atlas of the World's Endangered Languages edited by C. Moseley · London & New York: Routledge

The status of the least documented language families in the world ( pp. 177-212 ) . Hammarström, Harald (2010) · Language Documentation and Conservation. 4 http://scholarspace.manoa.hawaii.edu/bitstream/handle/10125/4478/hammarstrom.pdf;jsessionid=76414DD90F95DF076959B1AEB0158091?sequence=1

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

Maku, Sape and Uruak Languages: Current Status and Basic Lexicon ( pp. 133-140 ) . Ernesto C. Migliazza (1978) · Anthropological Linguistics. XX (3) ·

Languages of the Orinoco-Amazon Region: Current Status ( pp. 17-139 ) . Ernesto C. Migliazza (1985) · In South American Indian Languages: Retrospect and Prospect edited by Harriet E. Manelis Klein and Louisa Stark · Texas University Press

Los Uruak (Arutani) ( pp. 407-426 ) . W. Coppens (1983) · In Los Aborigenes de Venezuela, Vol II Monografía / Fundación la Salle · Vol. 29 · edited by W. Coppens · Caracas: Fundación la Salle

Sprachen . Theodor Koch-Grünberg (1928) · Von Roroima zum Orinoco: Ergebnisse einer Reise in Nordbrasilien und Venezuela in den Jahren 1911-13 · Vol. 4 · Stuttgart: Strecker und Schröder