Bibliography
Bibliography of Vitality:
Dimmendaal, Gerrit J. and F. K. Erhard Voeltz. 2007. "Africa." In Encyclopedia of the World's Endangered Languages, edited by Christopher Moseley. Routledge.
Bibliography of Locations:
Roger Blench. 2011. "An Atlas of Nigerian Languages." Mallam Dendo. Online: http://www.rogerblench.info/Language/Africa/Nigeria/Atlas%%20of%%20Nigerian%%20Languages-%%20ed%%20III.pdf.
Bibliography of Context:
Blench, R. (1999). Field trip to record the status of some little-known Nigerian languages. Ogmios Newsletter, 11-14.