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

México. Lenguas Indígenas Nacionales en Riesgo de Desaparición . Javier López Sánchez and Alejandra Arellano Martínez and Almandina Cárdenas Demay and Marisol Flores Castro (2012) · edited by Arnulfo Embriz Osorio and Óscar Zamora Alarcón (coordinadores) · INALI http://site.inali.gob.mx/pdf/libro_lenguas_indigenas_nacionales_en_riesgo_de_desaparicion.pdf

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) ·