Bibliography

Bibliography of Vitality:
Ethnologue: Languages of the World, 20th Edition (2017)
Bibliography of Locations:
Moseley, Christopher (ed.). 2010. Atlas of the World’s Languages in Danger, 3rd edn. http://www.unesco.org/culture/en/endangeredlanguages/atlas. (03 June, 2011.)
Bibliography of Context:
Ethnologue: Languages of the World, 20th Edition (2017)