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) ·

Endangered Languages in Central Africa ( pp. 163-178 ) . Bruce Connell (2007) · In Language Diversity Endangered edited by Matthias Brenzinger · Mouton de Gruyter

The status of the least documented language families in the world ( pp. 177-212 ) . Hammarström, Harald (2010) · Language Documentation and Conservation. 4 http://scholarspace.manoa.hawaii.edu/bitstream/handle/10125/4478/hammarstrom.pdf;jsessionid=76414DD90F95DF076959B1AEB0158091?sequence=1

Languages of Wadai-Darfur ( pp. 42-79 ) . Doornbos, Paul and Bender, Marvin Lionel (1983) · In Nilo-Saharan language studies Monographs from the Committee on Northeast African Studies, #13 · edited by Bender, Marvin Lionel · African Studies Center, Michigan State Univ.

Links between Cushitic, Omotic, Chadic and the position of Kujarge . Roger M. Blench (2008) · http://www.rogerblench.info/Language%%20data/Afroasiatic/General/Blench%%20paper%%20Cushitic%%20symposium%%20Paris%%202008.pdf

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

Kujarge . Paul Doornbos (1981) ·

Languages of Wadai-Darfur ( pp. 43-79 ) . Paul Doornbos and Lionel M. Bender (1983) · In Nilo-Saharan language studies Monograph / Committee on Northeast African studies · Vol. 13 · edited by Bender, Marvin Lionel · East Lansing: African Studies Center, Michigan State Univversity