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) ·

Africa ( ch. 7 ) . Gerrit J. Dimmendaal and F. K. Erhard Voeltz (2007) · In Encyclopedia of the World's Endangered Languages edited by Christopher Moseley · Routledge

Language Death: The Case of Qwarenya (Ethiopia) ( pp. 143-162 ) . David L. Appleyard (1998) · In Endangered Languages in Africa edited by M. Brenzinger · Köln: Rüdiger Köppe