Bibliography

Bibliography of Vitality:
Lewis, M. Paul, Gary F. Simons, and Charles D. Fennig (eds.), 2013. Ethnologue: Languages of the World, 17th edition. Dallas, Texas: SIL International. Online version: http://www.ethnologue.com.
Bibliography of Locations:
Lewis, M. Paul (ed.). 2009. Ethnologue: Languages of the World, 16 edn. http://www.ethnologue.com/home.asp. (15 February, 2011.)
Bibliography of Context:
Lewis, M. Paul, Gary F. Simons, and Charles D. Fennig (eds.), 2013. Ethnologue: Languages of the World, 17th edition. Dallas, Texas: SIL International. Online version: http://www.ethnologue.com.