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Atlas of the World’s Languages in Danger . Christopher Moseley (ed.) (2010) · UNESCO Publishing http://www.unesco.org/culture/en/endangeredlanguages/atlas

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

ATLAS SOCIOLINGÜÍSTICO DE PUEBLOS INDÍGENAS EN AMÉRICA LATINA . (2009) · proeibandes http://www.proeibandes.org/atlas/tomo_2.pdf

Idiomas mayas: Número de hablantes y extension territorial . Liliana Pellicer (2005) · Revista D. Prensa Libre http://douglasvasquez.blogspot.com/2011/03/idiomas-mayas-numero-de-hablantes-y.html and http://www.monografias.com/trabajos-pdf2/guatemala-lenguas-mayas-desaparecer/guatemala-lenguas-mayas-desaparecer.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) ·